かわさき 健 & 古沢優: books on the charts
かわさき 健 & 古沢優 has 1 book on Apple Books charts today, with 1 chart entry across countries. Best position seen: #16 in Japan with オーイ! とんぼ 第65巻. BookTrendSpy has tracked 1 title by かわさき 健 & 古沢優 since 2 November 2026, including translations and audiobooks.
All tracked titles
| Title | Countries today | Peak | Peak country | Days on charts |
|---|---|---|---|---|
| オーイ! とんぼ 第65巻 | 1 | #16 | Japan | 2 |