Japanese adds a wall that many other languages do not have: the writing system itself. You can finish textbook dialogues and still stall in front of a real book, because every page asks you to handle kana, kanji, and unfamiliar vocabulary at once.
Graded readers built for tadoku — 多読, “read a lot” — dismantle that wall in stages. They offer real stories from a few hundred words up, with controlled language and furigana carrying you over kanji you have not learned yet.
This guide explains how the levels work, where to start, and how to test a book before you spend money. The series below are starting points, not personal recommendations from reading every title.
What is a Japanese graded reader?
A Japanese graded reader is a book written or adapted for learners. Vocabulary and grammar are controlled for each level, kanji carry furigana — small kana printed above them giving the reading — and pictures support the story. Audio is available for all titles in the tadoku series described here.
These readers follow shared principles under the stewardship of the NPO Tadoku Supporters. Tadoku's four rules are: start from a level you can enjoy; do not use a dictionary while reading; skip words or passages you cannot guess; and if a book stops being fun, quit it and pick another.
A native children's book is not the same thing. It assumes a native child's vocabulary and everyday knowledge, and is often written mostly in kana, which can make word boundaries harder, not easier, to see.
Tadoku levels are not CEFR levels
Tadoku levels are the NPO's own scale, Levels 0–5. They are not CEFR levels, and they should not be presented as official equivalents to anything else.
For a rough orientation, the US distributor Cheng & Tsui publishes an approximate JLPT crosswalk for the ASK series. It is a distributor's crosswalk, not an official equivalence:
- Level 0 ≈ JLPT N5, about 350 vocabulary words
- Level 1 ≈ JLPT N4–N5, texts of roughly 400–1,500 characters
- Level 2 ≈ JLPT N4, 1,500–2,500 characters and about 500 new words
- Level 3 ≈ JLPT N3–N4, 2,500–5,000 characters and about 800 new words
- Level 4 ≈ JLPT N3–N2, 5,000–10,000 characters and about 1,300 new words
See the distributor's table on the Cheng & Tsui Japanese graded readers page and the NPO's overview on its graded readers page.
The practical unit is the sample, not the label. Use the crosswalk to choose a first sample, then let the sample decide.
Four places to start
All of the series below are supervised by the NPO. Prices are listed on tadoku.org, checked 9 October 2026.
| Starting point | What you get | Why consider it |
|---|---|---|
| Web Tadoku Books | Free PDF stories published by the NPO itself | Zero cost, so you can start tonight |
| ASK Japanese Graded Readers, Level 0 pack | The main ladder, Levels 0–4, sold only as packs | A structured route with audio downloads |
| Nihongo Tadoku Books | Individual printed readers at ¥450–600 | The cheapest way to sample a real printed reader |
| Taishukan Japanese Readers | A ladder continuing to Level 5 | Useful if you want the longest graded route |
The details matter. ASK covers Levels 0–4, with 86 books in 16 packs of 5–8 books, at ¥2,300 per pack before tax, with audio downloads. Taishukan covers Levels 0–5 — the only series reaching Level 5 — with 55 books in 10 packs at ¥2,400–2,500 per pack. Nihongo Tadoku Books cover Levels 0–3 and include only 9 books so far, but are sold individually at ¥450–600. Web Tadoku Books are free PDFs from the NPO.
Use a ten-minute sample test
Before buying a pack, read a sample for ten minutes. With furigana helping you over kanji, you should follow who did what without a dictionary — tadoku says to put the dictionary away while reading, and to guess, skip, and continue.
Check three things: Can you follow the main action? Can you keep going without stopping on every line? Do you want the next page?
If you decode kana so slowly that the story evaporates, drill kana first. That is a script problem, not a level problem. Level 0 assumes you can read hiragana, with katakana learned soon after; kanji carry furigana, so you do not need to know kanji in advance.
Paper packs, PDFs or the app: check before you buy
Format changes the budget. Packs are the default for ASK and Taishukan, so budget for a pack rather than a single book. The NPO's free PDFs and individually sold books are the flexible route. Nihongo Tadoku Books are also available as an app via White Rabbit Press, from ¥350.
For digital reading, Lucerna is a reader app that imports EPUB, PDF, and TXT files you are authorised to use; check that a PDF's text is selectable. Lucerna supplies no books.
In a Lucerna session, you can look up a word, ask for a sentence analysis, and save recurring words. Its AI features use your own API key, so provider charges may apply; the desktop version also supports local models. A free guest can use 1 book and save 5 words; a free account allows 5 books and 200 saved words.
Turn one short passage into a reading session
The passage below was written for this guide. In plain text, this guide writes furigana as the reading in parentheses after a kanji:
ゆうきさんは 駅(えき)で 電車(でんしゃ)を 待(ま)っていました。電車(でんしゃ)が 来(き)て、ゆうきさんは 笑(わら)いました。今日(きょう)は 友達(ともだち)に 会(あ)える 日(ひ)です。
Read first for the action. The parentheses show furigana's job: they print the reading over — here, after — a kanji, so the sentence can keep moving. 駅(えき) means “station,” and 電車(でんしゃ) means “train.” Those two nouns place the scene.
Then notice ました. This polite past ending appears in 待っていました and 笑いました, and it is the story's engine: waiting happened, then smiling happened. Read the passage again and let the known pieces carry the rest.
When should you try an original?
After the top tadoku levels, bridge gradually. Manga or light novels you already know in translation can work well, because a familiar plot supports unfamiliar language — the same reason rereading a book you already know is a useful bridge.
Native children's books are a different difficulty, not a lower one. For contrast, French graded readers follow a CEFR-labelled ladder instead; see French graded readers for A1–B1.
Questions before you choose
Can I start at Level 0 knowing only hiragana?
Yes — that is what Level 0 is designed for. Learn katakana alongside it, and rely on furigana for kanji.
Is Level 2 the same as JLPT N4?
No. The Cheng & Tsui crosswalk is a distributor's approximation. Tadoku levels are the NPO's own scale.
Are the free books really free?
Yes. Web Tadoku Books are published free as PDFs by the NPO itself; start from the NPO's graded readers page.
Can I read these in Lucerna?
If you have an authorised EPUB, PDF, or TXT file, yes. Lucerna supplies none of these books. A free guest can use 1 book and save 5 words; a free account allows 5 books and 200 saved words.
Levels and prices checked against tadoku.org on 9 October 2026. The selection method and reading routine are our suggestions, not the NPO's guarantees.