| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Mentaru kyoka mesoddo yonjugo: Supotsu de hyakunijippasento no chikara o dasu. | 978-4-408-45407-8 (4-408-45407-9) | 2013 |
| Zettai ni kienai yaruki no okoshikata: Nazeka doryoku ga karamawarishiteiru anata e | 978-4-408-45268-5 (4-408-45268-8) | 2010 |