| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| High school chemistry easy to understand the universe one ISBN: 4053038545 | 978-4-05-303854-8 (4-05-303854-5) | 2013 |
| It is easy to understand one by one junior high school English word.: CD with ISBN: 4053038480 | 978-4-05-303848-7 (4-05-303848-0) | 2012 |
| Kanbun yama no yama. | 978-4-05-304029-9 (4-05-304029-9) | 2014 |