H-O. · Hayato Ohwada · Heide Otto · Heidi Ott
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Ai de sekkusu o kau otoko sekkusu de ai o kau onna = MAN WHO BUYS SEX BY LOVE WOMAN WHO BUYS LOVE BY SEX: Shinrigaku de yomitoku danjo no chigai | 978-4-86063-413-1 (4-86063-413-6) | 2010 |
| Kare to fukuenshitai anata e | 978-4-86063-258-8 (4-86063-258-3) | 2008 |