How we review books
What we verify, how well we actually know each book, and how verdicts get written.
The short version
Every bibliographic fact is checked against the National Diet Library. Every review states plainly how well we know the book. And every verdict tells you who should not buy it.
01
What we check
The bibliographic record for every one of the 16 books on this site — ISBN, edition, page count and Japanese list price — is verified against NDL Search, the catalog of Japan's National Diet Library. Prices are the list prices printed on the book (本体価格), before tax. Where NDL has no record of a figure, we leave the field empty rather than guess.
Editions are distinguished explicitly. A revised So-matome volume is not the same book as the one reviewed on a decade-old blog post, so every book page states the exact edition and printing year it describes. When a publisher revises a book we cover, the review is flagged until we have checked the new version.
02
Review states
Not every page here reflects the same depth of acquaintance, and pretending otherwise is how review sites go bad. Each book sits in exactly one of these states:
| Hands-on reviewed | We worked through the book — did the exercises, sat the practice sections, finished the chapters. The highest confidence we offer, and the only state that supports a detailed verdict. |
|---|---|
| Physical copy inspected | We have held and paged through a physical copy: layout, explanations, audio access, print quality. We have not worked through it cover to cover, and the review says so. |
| Official sample inspected | Assessed from the publisher's official sample pages and table of contents. Good for judging structure and tone; silent on how the book feels over six weeks of study. |
| Catalog information only | We have not seen the book. The page carries verified bibliographic data and nothing more. It is clearly labeled as such, and a book in this state never receives a “best” verdict. |
| Review pending update | A new edition or revised printing has appeared. The existing review stays up, flagged, until we have re-checked it against the new version. |
03
How verdicts are written
Verdict first. The conclusion sits at the top of the page and the evidence follows, so you can leave after one paragraph if that is all you need. And every verdict includes who should not buy the book — a recommendation that fits everyone fits no one, and “Not ideal for” is a permanent section of every review.
Recommendations are never influenced by affiliate commissions. The commission is broadly the same whichever book you buy — and nothing at all when we tell you to skip a purchase, which we do routinely. How the money works is spelled out in the affiliate disclosure.
One more honest note: this site is written by one person, not a team of experts, and it claims no credentials beyond the work shown on each page. More on that on the About page.
04
Corrections
When we get something wrong — a price, an edition, a judgment that did not survive contact with the book — we fix it and leave a note on the page saying what changed. Spotted an error? Write to the address on the About page.
Last updated August 2026.