Kotoshima
Tell Kotoshima what you need Japanese for. AI shapes real sentences around your goals, interests, level, and daily life.
Listen & shadow
水が必要です。
Active recall
I need water.
水が必要です。
Dashboard
Your study plan for today.
The gap
Kotoshima trains the sentences real situations actually call for — the ones you'd normally only pick up after months of mistakes and corrections. Learn them straight, and be ready to say it when it counts.
Here's what we mean.
“Can we pay separately?”
You can ask how much something costs.
Dinner's over. Four people, one check.
You don't know how to say "separately."
Can we pay separately?. 別々に払えますか。
Two words your textbook skipped. The ones that save the moment.
“Could you speak a little more slowly?”
You can conjugate verbs. You can describe your day.
Someone just answered you — too fast to follow.
You smile. You nod. You understood nothing.
Could you speak a little more slowly?. もう少しゆっくり話していただけますか。
This is what gets you the second try!
You don't need fluency to walk into these moments with confidence.
You need the right sentences — ready before you need them.
That's what Kotoshima trains: not grammar drills, but the moments themselves.
Your daily loop
Dashboard builds a short queue from the topics and situations you chose — no generic lesson order, just your sentences moving from new to confident to mastered.
Step 1
Build a clear meaning anchor before pronunciation work begins.
Sentence journey
Understood
Try it · Confirm meaning
1 / 2
What time is it now?
今何時ですか？
いまなんじですか？
Read it. Listen if it helps. Continue only once the meaning is clear.
Step 2
Turn understanding into speech by matching rhythm and intonation.
Sentence journey
Spoken
Try it · Listen & shadow
今何時ですか？
いまなんじですか？
What time is it now?
Your turn — shadow now
Step 3
Strengthen retrieval by producing Japanese before seeing the answer.
Sentence journey
Retrieved
Try it · Active recall
Say this in Japanese
What time is it now?
Answer
今何時ですか？
いまなんじですか？
English came first — Japanese didn't.
Send it back through listen & shadow so the shape sticks in your mouth.
Step 4
Bring confident sentences back at widening intervals so they remain available and wired to your subconscious.
Sentence journey
Retained
Try it · Retention over time
A confident sentence leaves today's queue, then returns at widening intervals.
Active queue
Confident shelf
AI-personalized learning
Describe the Japanese you need — a trip, your job, a hobby, a relationship, or something entirely your own. AI builds a focused island around your level and preferred depth.
Audio built for shadowing
Playback speeds from 0.5× to 1.5×, looping, and sentence-level audio so you can train your mouth without hunting for clips.
Island sharing
Share what you've built with a friend, a study group, or your classroom — they can try it instantly, no account needed to preview.
AI-generated conversations
Describe a conversation/theme you want to handle. Kotoshima generates a natural two-person scene you can listen to, shadow, and say out loud.
Try it · Narration
You look exhausted
Two close friends talking at home when one realizes the other may be getting sick
Product walkthrough
See a personal idea become an AI-built island, then move through audio, daily practice, progress, and sharing.
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Plans
Two simple tiers. Numbers below are placeholders — checkout is not live yet.
Start here
A complete daily practice loop for building useful Japanese one sentence at a time.
More room
Higher limits for learners who keep more islands in motion and want deeper progress views.
Dummy pricing preview · no payment or Plus entitlement exists yet. Full pricing page
Tell Kotoshima what you want to say. Get a focused island shaped to your needs, then practice it until it comes naturally.
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