| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Was not on the textbook - border such different reasons! ISBN: 4883926370 | 978-4-88392-637-4 (4-88392-637-0) | 2008 |
| Zeikin wa kanemochi kara tore: Fuyuzei o donyu sureba shohizei wa iranai. | 978-4-906605-83-5 (4-906605-83-4) | 2012 |