The short version

“Behind” is not one thing. It is three, and they run on three different clocks

When a Japanese teacher says a returnee child is behind, they are almost never describing a single deficit. They are describing the net effect of three distinct abilities that happen to share a name. Separating them is the single most useful thing you can do before the move, because the runway is short and each gap takes a different kind of work.

The first is school-register spoken Japanese. This is not the Japanese your child uses with you. Home Japanese is warm, forgiving, repetitive, and spoken by people who already know what your child means. School Japanese is fast, spoken by thirty children at once, full of routine phrases that appear nowhere in family life, and it requires switching between plain and polite forms depending on who is being addressed. A child can be perfectly fluent at the kitchen table and mute in a classroom, and this is not shyness. They have never heard the dialect of the place they are going.

The second is literacy — reading and writing, which in Japanese means the kanji schedule. This is the gap with the hardest floor, because it is not an ability that develops with exposure. It is a curriculum, delivered in a fixed order, at a fixed rate, over six years. If your child has not been on that schedule, they are not “slow at kanji.” They were never enrolled in the thing that teaches it.

The third is the language the subjects are taught in — the Japanese of a maths word problem, a social-studies textbook, a science worksheet, a test instruction that says to answer in your own words within forty characters. This is the gap nobody sees in the first month, because it does not show up in conversation. It shows up on the first test, and it is the one most likely to be misread as “he is not very academic.”

Here is why the separation matters so much when a move is coming. Parents with six months left overwhelmingly reach for kanji drills, because kanji is the visible, countable, purchasable gap. It feels like progress. But if your child cannot yet operate in a classroom, kanji flashcards will not help them survive September, and the hours spent on them are the hours that could have bought the thing that does move fast. Conversely, a child who already chatters happily with cousins and will enter Grade 5 does not need more conversation practice — they need the literacy schedule they never started, and no amount of family video calls will supply it.

The runway is for the gap that will not close by itself after you land. School-register speech largely will, once your child is surrounded by children who have no other language to offer them. Literacy and subject language largely will not, because the school will be moving forward at full speed while your child is still behind, and nobody stops the curriculum to wait.

Gap one: the Japanese of a classroom is not the Japanese of your kitchen

Almost every family we hear from has underestimated this gap, and for a completely rational reason: the evidence in front of them says their child is fine. The child talks to the Japanese parent. The child handles a video call with grandparents. The child orders ramen on holiday. All of that is real, and none of it is the thing a classroom asks for.

What a Japanese classroom asks for, in the first week, is roughly this. Follow an instruction given once, to the group, at normal speed, with no eye contact and no repetition. Understand a set of routine phrases that structure the day and appear nowhere in a family — the words for lining up, for the duty rota, for the cleaning period, for “bring this back signed tomorrow.” Switch register when addressing a teacher rather than a friend, without being told to. Join a conversation already in progress among six children who talk over each other. Ask for help in a way that does not sound either rude or babyish.

Each one of those is learnable fast, which is the good news. They are learnable in weeks, not years, because they are a finite set of forms attached to a situation, and immersion in the situation teaches them efficiently. The bad news is that they are almost impossible to teach at home, and for a structural reason we have written about at length in our guide to children who understand Japanese but will not speak it: you are bilingual. Your child knows you understand their stronger language. There is no conversation they can fail at with you, so there is no pressure that forces production. A parent can build comprehension endlessly and barely move speech.

What moves speech is a listener who cannot switch. A cousin in Japan who speaks no English. A teacher who genuinely does not follow. A group of children the same age who will simply move on if your child does not keep up. This is why the single highest-value thing you can buy in the runway is not vocabulary — it is unswitchable listeners, on a schedule, with the same faces each time so that the relationship is worth the effort of speaking.

One concrete and underused move: in the months before you go, stop being the interpreter. On calls with Japanese relatives, leave the room. Parents translate out of kindness and in doing so remove the entire reason to try. The call will be worse for a few weeks. Then it will be better than it ever was.

Gap two: literacy is a schedule, and you cannot compress a schedule

This is the gap parents most often discover too late, and the one where honest arithmetic is more useful than encouragement. A Japanese elementary school does not teach reading as a skill that emerges. It delivers a specified set of characters in a specified order over six years, inside a specified number of hours, and every subsequent year of schooling assumes the previous year’s set is in place.

Read the running total column with your child’s entry grade in mind, because that is the number the school will quietly assume. A child joining Grade 4 in Japan is expected to arrive owning 440 characters. A child joining Grade 6 is expected to arrive owning 835. Not recognise — own, well enough to read a textbook at normal speed without the reading itself consuming all their attention.

Now the comparison that reframes the whole problem. A Saturday supplementary school running three hours a week for forty weeks delivers about 120 hours a year. A diligent twenty minutes a day at home, every day, delivers about 120 hours a year as well. The Japanese school delivers 1,461 hours across six years — roughly 245 a year, and crucially, delivered by someone whose job is to teach the sequence rather than test it. The point is not that your family has been failing. The point is that your family was never running the same machine. A child who has been doing excellent, consistent work at home can still arrive two or three years down the schedule, and that outcome contains no evidence about your child or about you.

If literacy turns out to be your main gap, the mechanics of closing it — where to start, why the right reading level feels insultingly easy, what to do about handwriting, and why kanji apps so often produce recognition without reading — are set out in detail in our guide for children who speak Japanese but cannot read or write it. We will not repeat that material here. What matters for a family with a departure date is the scheduling decision, and that decision is this: in the runway, buy teaching, not testing. Drilling characters your child has never been taught is testing. Someone sitting with them and introducing new characters in sequence, in context, with reading attached, is teaching. Only the second one moves the running total.

Gap three: the language the subjects are taught in, which nobody notices until the first test

This is the quietest gap and the one that does the most long-term damage, because it is systematically misattributed. A child arrives, settles in, makes friends, chats in the corridor, and six weeks later brings home a maths result that makes no sense given that they were two years ahead in maths at their last school. The conclusion the family reaches — and often the school reaches — is that the child has gaps in maths. They do not. They have gaps in the Japanese that maths is written in.

The distinction between conversational fluency and the academic language of schooling is one of the better-established ideas in bilingual education, usually credited to Jim Cummins, and it is the reason a child can sound entirely fine and still be unable to access a lesson. Conversation is supported by context, faces, gesture, and a listener who repairs misunderstandings on the fly. A textbook paragraph offers none of that. A test instruction offers less than none: it is deliberately precise, often in the negative, and frequently about how to answer rather than what the answer is.

What this means practically for the runway is unglamorous. If your child is entering upper elementary or junior high, the highest-value preparation is not more conversation and not only kanji — it is contact with Japanese textbook language in the subjects they will be tested in. Working through a grade-appropriate Japanese maths workbook, in Japanese, with someone who can explain the wording, does two jobs at once: it pre-loads the vocabulary of the subject and it reveals which of the three gaps is actually binding. A child who can do the maths once the question is read aloud to them has a language problem. A child who cannot do it either way has something else to look at.

And one more thing worth saying plainly to parents of younger children: in Grade 1 and Grade 2, this gap is close to nonexistent, because everyone is starting the subjects at the same time. The younger your child, the more of the work the Japanese school will do for you — and the more honest it is to say that the runway matters less. If you are moving with a five-year-old, much of the anxiety in this guide is not yours to carry.

What Japan actually provides after you land

Families often arrive with one of two beliefs, and both are wrong in expensive ways. The first is that the school will have a programme for this and it will be handled. The second is that there is nothing and you are entirely on your own. The real picture is in between, and it is published.

Three things in that table change how a family should plan.

First, your child is in this statistic, not outside it. The 11,446 figure for children holding Japanese nationality is the returnee population, and it is substantial. Parents sometimes assume Japanese-language support is a provision for foreign residents and that a Japanese passport means their child will simply be treated as a Japanese child who happens to be behind. Both halves of that can happen, and neither is a good outcome: treated as needing support, your child may get it; treated as a Japanese child who is behind, they may get nothing but a lower mark.

Second, support reaches most children but not all. Three-quarters of children at compulsory-school level receive instruction under a formal special curriculum. That is a real system doing real work. But one child in nine, nationally, receives no special provision at all — and whether yours is in that group depends heavily on the municipality you land in and on how clearly the need is identified at enrolment. This is the strongest practical argument for doing the work before you arrive: you cannot know in advance which kind of school you are moving into, and the runway is the part you control.

Third, the support thins out dramatically with age. 76.4% at compulsory stage against 15.6% at upper-secondary stage is not a small difference, and it maps onto the progression figures underneath it. A child who arrives in Grade 3 is arriving into a system that is set up to help. A child who arrives at sixteen is arriving into one that largely is not.

On the mechanics of enrolment itself — notification, the ward office, the documents, what to expect in the first interview — we have a separate guide: starting Japanese elementary school. This guide deliberately stays on the language side.

Measuring your own child’s gap in one afternoon

Before you decide what to spend the runway on, you need to know which gap is binding. This takes about an hour and needs no tests, no assessments and no appointments. Five probes, and then be honest about what you saw.

Probe one: the instruction, once, to the room. With your child in the same room but not looking at you, and without using their name, say a two-step instruction at your normal adult speed — the sort a teacher gives to a class. Do not repeat it. Do they act on both steps? One step? Neither? This probes classroom listening, which is a different thing from listening to a parent who is addressing them directly.

Probe two: the three-minute monologue. Ask them to explain something they know well — a game, a film plot, how to do something — in Japanese, for three minutes, uninterrupted. Do not help. Count how many times they stop and switch languages, and notice whether the sentences get shorter as they go. A child whose first thirty seconds are fluent and whose last thirty are single words has conversational Japanese and no stamina, which is extremely common and very fixable.

Probe three: the cold page. Find a Japanese text written for two grades below the grade they will enter, and ask them to read a page aloud. You are not listening for comprehension. You are listening for stopping. Fluent reading means the eyes are ahead of the voice. If they are decoding character by character, the running kanji total is the binding gap, whatever else is true.

Probe four: the word problem. Give them a maths question from their coming grade, written in Japanese, at a level you know they can do mathematically. Can they do it from the page? If not, read it aloud to them and ask again. A child who fails from the page and succeeds from your voice has a subject-language gap, cleanly isolated. This is the most diagnostic single probe in the list.

Probe five: the unswitchable stranger. Put them on a call with someone Japanese who they do not know well and who has no English, with you out of the room, for ten minutes. Then ask the adult afterwards — not your child — how it went. Children consistently report that these conversations went fine. Adults consistently report what actually happened.

If you have twelve months or more

This is the comfortable case, and the way to waste it is to start slowly because there is time. Twelve months is enough to close the speech gap substantially and to make real progress on literacy. It is not enough to deliver three years of the kanji schedule, so do not plan as if it is.

Months 1–3: make Japanese a place, not a subject. Establish regular contact with Japanese-speaking peers who cannot switch — this is the single structural change that makes everything else work. Stop interpreting on family calls. If literacy is the binding gap, begin instruction now rather than later, at a level where reading is easy, and accept that it will feel too easy.

Months 4–8: build stamina and start the schedule properly. Speech work shifts from “can they say it” to “can they keep going for twenty minutes.” Literacy becomes a sequence rather than a set of sessions — characters introduced in order, with reading attached, every week, tracked. This is the phase where a child goes from recognising kanji to reading them, and it is slow and unexciting and the most valuable part.

Months 9–12: switch to the destination. Now it becomes specific. Japanese textbooks and workbooks for the grade they will enter, in the subjects they will be tested in. Classroom routine vocabulary. The polite forms they will need with a teacher. If possible, a trip to Japan that includes school — many public schools will accept a short experience visit, and a week inside a real classroom teaches more about what is coming than a year of speculation.

If you have about six months

Six months forces a choice, and the choice is almost always the same one: spend it on speech and on destination-specific preparation, and accept that the literacy gap will be closing after you arrive rather than before.

The reasoning is arithmetic. Six months of good work at home might deliver 60 to 100 hours. Against a running kanji total of several hundred characters, that is a meaningful dent and not a solution. The same 60 to 100 hours spent on classroom-register speech can plausibly take a child from unable to operate in a classroom to able to operate in one, because that gap is small and responsive. The first outcome makes September survivable. The second does not.

So: unswitchable peers, weekly, from this week. Stop interpreting. Routine classroom vocabulary — the day’s phrases, the duty rota, the words for asking a teacher for help. Begin literacy instruction anyway, because starting the sequence matters more than finishing it, and a child who arrives mid-sequence with a teacher already in place continues; a child who arrives having done nothing starts from zero in the worst possible week.

And do the one piece of preparation nobody thinks of: teach your child the sentence they will need on day one. Not vocabulary — a specific, rehearsed, comfortable way to say “I have just come back from abroad, my Japanese reading is still weak, could you say that again.” A child who can say that fluently is in a completely different position from a child who goes silent, and it takes ten minutes to teach.

If you have three months or less

Three months is not a language programme. It is triage, and the honest framing is that you are preparing your child for the first month rather than closing a gap.

Four things, in this order. One: unswitchable listeners, as often as you can manage, with the same people each time. Two: the day-one sentences — asking for repetition, asking for help, explaining their situation, saying they do not understand without apologising for it. Rehearse until they are automatic. Three: the routine vocabulary of a Japanese school day, which is a short and finite list. Four: set the expectation, with your child, out loud, that the first month will be hard and that this is a logistics problem rather than a verdict on them. Children who are told this cope visibly better than children who are told everything will be fine.

What to skip: kanji sprints, grammar study, anything that generates a feeling of productivity without changing what happens in a classroom. And do not start a new tutor in the final fortnight of a move. Everyone is exhausted and nothing sticks.

If you have already moved

Then the runway is behind you and a different guide applies. Two things are worth saying here.

The first is that the first six to eight weeks are not data. Almost every returnee child looks worse in week three than they will in week twelve, because they are spending every cognitive resource on survival and have nothing left for performance. Teachers who have seen returnee children before know this. Teachers who have not sometimes do not.

The second is that the gap that persists after the speech gap closes is the one to act on, and it is usually literacy or subject language. If your child is now talking happily and struggling academically, that is the signature of gap three, and it is not resolved by more time. We have written separately about returnee children who are struggling after starting school in Japan, including what to ask the school for and how the special-curriculum provision actually works in practice.

What does not work in the months before a move

Some of these are harmless wastes of a scarce resource. Others actively make the arrival worse.

Kanji apps as the main plan. They are good at recognition and bad at reading, and the difference matters enormously when a textbook arrives. A child who can pick the right character out of four options cannot necessarily read a sentence containing it. If an app is your whole literacy plan, you are buying the measurable half of the skill.

A one-to-one tutor who speaks your child’s stronger language. For literacy instruction this can be excellent. For speech it is close to useless, for the same reason parents cannot build speech: the escape hatch is open. If the tutor can understand English, the child will use English the moment it gets difficult, and difficulty is where the learning was.

A sudden Japanese-only rule at home. Imposed with a deadline attached, this reliably backfires. It converts Japanese from a relationship into a demand, at exactly the moment the child is already losing their friends, their school and their house. We have seen families lose two years of goodwill in a month this way.

Waiting for the move to fix it. Immersion does fix the speech gap, mostly, and it is the main reason to be optimistic. It does not fix literacy, because the school will be moving at full speed through material that assumes the previous grades are done, and it does not fix subject language, because that gap is invisible to everyone until the results arrive.

Choosing a grade placement to solve a language problem. Some families ask to have the child placed a year below their age. Occasionally this is right. Often it trades a language gap, which closes, for a social and developmental mismatch, which does not. It is a decision to make with the school on the child’s specific situation, not a default.

Read the third column honestly: group lessons with Japanese-speaking peers are the wrong tool for subject-specific textbook language and for producing a record a Japanese school will recognise, and they are not a replacement for literacy instruction delivered in sequence. That is a real limitation and it is why the row exists. Buying one format and expecting it to cover all three gaps is the most common planning mistake we see.

Age by age, with a move coming

Preschool and Grade 1. The easiest case by a wide margin. Everyone starts literacy together, subject language barely exists yet, and the speech gap closes fast. Spend the runway on exposure and on making Japanese feel ordinary. Most of the worry in this guide is not yours.

Grades 2–3. The literacy schedule has started but the running total is still small — 240 characters by the end of Grade 2. This is the sweet spot for catching up, because the gap is real but finite and the school is still teaching reading rather than assuming it. If you have a year, a child this age can plausibly arrive close to on-schedule.

Grades 4–6. The hardest elementary case, because the running total is in the hundreds and the subjects have started to be taught in writing. Literacy becomes the priority alongside speech, and subject-language preparation starts to matter. A full catch-up before arrival is usually not realistic; the goal is to arrive mid-sequence with momentum rather than at the start.

Junior high. Now the constraint is not just the schedule but the stakes, because what happens here feeds into high school entrance. Subject language moves to the front. Speech still matters socially and still closes fast. Be realistic with the school about what your child can read, early and in writing, rather than hoping it goes unnoticed.

Older teenagers. The support system thins out sharply — 15.6% receiving formal special-curriculum provision at upper-secondary level, against 76.4% at compulsory stage. If your child is sixteen and moving, the language plan and the school plan have to be made together, and international or alternative routes deserve genuine consideration rather than being treated as failure.

Where an online Japanese school fits — and where it does not

Everything above points at one structural need that most families cannot meet locally: regular contact with Japanese-speaking children who have no other language to offer, on a schedule, with the same faces each time. If you live near a Japanese community you may be able to assemble this in person, and you should. Most families moving back from abroad cannot, particularly in the final months when the local Japanese network is the thing they are leaving.

This is the specific job an online Japanese school can do, and it is worth being precise about the limits. It builds speech, stamina and the willingness to produce. It does not deliver the kanji schedule in sequence, it does not teach your child’s coming maths textbook, and it does not produce the written record a Japanese school will want to see. If you need those, you need a supplementary school or a tutor as well, and most families moving back use both.

Who this is not right for

We would rather you did not spend money badly, so here is the list.

If literacy is clearly your only gap — your child talks easily with Japanese-speaking peers already and the problem is purely the running kanji total — then speaking practice is not what you need, and a supplementary school or a reading tutor is a better use of the runway.

If your child is in the final weeks before a move, adding a new weekly commitment to a household that is packing a container is unkind to everyone. Start after you land, or start three months earlier next time.

If you need documentation — a record of Japanese-language study that a Japanese school or an entrance process will formally recognise — that is what in-person supplementary schooling and recognised programmes are for.

If your child is in genuine distress about the move, the language plan is not the first problem. A child who is grieving a school, a house and a set of friends does not have spare capacity for a new obligation, and forcing one tends to attach the grief to Japanese. Wait.

A ninety-day runway plan

If you want one structure to follow rather than a set of principles, this is it. It assumes the probes above told you speech is the binding gap, which is the most common result for a family moving back.

Frequently asked questions

Sources used for this guide

A deadline is an advantage, if you spend the runway on the right gap

Of the three gaps, the one that moves fastest is the one that needs other children — and it is the hardest to arrange in the months when you are leaving. TOMODACHI JAPAN puts children abroad into classes of eight with peers in Japan who do not speak English, grouped by what each child can actually say. The pilot opens in December 2026 and the school guide is free.

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