| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| 7jigen karano kansha: Daifugo ga mainichi jissensuru ichiban shinpuruna seiko hosoku. | 978-4-8284-1422-5 (4-8284-1422-3) | 2008 |
| Taisetsuna hito ni hanashitai 7tsu no monogatari. | 978-4-8284-1453-9 (4-8284-1453-3) | 2008 |