| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Daigaku jidai shinakereba naranai 50 no koto | 978-4-569-57485-1 (4-569-57485-8) | 2000 |
| Law of 77 game will be able to sit down together at up to three years at the company | 978-4-569-57118-8 (4-569-57118-2) | 1998 |
| Naze ano hito wa kaiwa ga tsuzukunoka | 978-4-86063-401-8 (4-86063-401-2) | 2010 |