Books
Textbooks made with AI.
Based on classroom practice, these textbooks were planned, written and given audio with the help of AI. Most come with audio and a practice app, so you can start learning right away on your smartphone. The books are in Japanese; click a cover to open its Amazon page.
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Korean × Kanji
漢字から広がる韓国語の世界 入門編
Korean Through Kanji: Introductory — Sino-Korean words chained from 55 characters
Starting from 55 basic characters such as 人 (인), learn Sino-Korean vocabulary in connected chains. Covers TOPIK levels 1–4, with a practice app.
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Korean × Kanji
漢字から広がる韓国語の世界 中級編
Korean Through Kanji: Intermediate — reading Sino-Korean words with 199 characters
Using the readings of 199 characters as clues, systematically expand your intermediate Sino-Korean vocabulary. TOPIK levels 1–4, with a practice app.
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Korean × Kanji
漢字から広がる韓国語の世界 接辞編
Korean Through Kanji: Affixes — Sino-Korean words built from 24 affixes
With 24 affixes such as 的 and 性, multiply your Sino-Korean vocabulary many times over. TOPIK levels 1–4, with a practice app.
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Korean
3ヶ月でレベルアップ 韓国語 料理編
Level Up in 3 Months: Korean, Cooking Edition — 60 audio tracks and a review app
Kimchi fried rice, bibimbap, tteokguk… 12 lessons that teach conversation and grammar through 12 seasonal Korean dishes. Upper-beginner level.
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Chinese
3ヶ月でレベルアップ 中国語 料理編
Level Up in 3 Months: Chinese, Cooking Edition — HSK levels 3–4
Dumplings, mapo tofu, Peking duck, hot pot… 12 lessons built around 12 dishes from across China. 93 audio tracks and a practice app with 282 vocabulary cards.
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Japanese・Chinese・Korean
漢字、三度迷う
Kanji, Lost Three Times — dots and lines: stories of kanji words shared by Japanese, Chinese and Korean
How does the same kanji word change its meaning across Chinese, Japanese and Korean? Starting with 老婆, stories of words that travel between the three languages.