世界第一初恋 OAD

Included with the limited edition of Comic Volume 5 (released March 22, 2011), which came with a premium anime DVD, it contains Episode 0 (approximately 20 minutes) of "Sekai-ichi Hatsukoi ~Onodera Ritsu no Baai~". The staff is largely the same as the TV anime version. Included with the limited edition of Comic Volume 6 (released September 27, 2011), which came with a premium anime DVD. The title is "Sekai-ichi Hatsukoi ~Hatori Yoshinuki no Baai~", and it is considered Episode 12.5 (approximately 20 minutes) of the TV anime series. The original source material is "Hatori Yoshinuki no Baai No.1".