The Japanese publisher Kadokawa Shoten announced that the sixth limited edition volume of Shungiku Nakamura's Sekai-ichi Hatsukoi ~Onodera Ritsu no Baai~ boys-love manga will bundle an anime DVD with "episode 12.5" in late September. The manga already inspired an ongoing Sekai Ichi Hatsukoi television anime series and an earlier original anime DVD that came with the fifth manga volume.

The sixth limited edition manga volume's "premium anime DVD" will include the episode "Yoshino Chiaki no Baai" (Chiaki Yoshino's Situation), which is about 20 minutes long. The cast members Shinnosuke Tachibana (Chiaki Yoshino) and Yuuichi Nakamura (Yoshiyuki Hatori) will voice the episode. The limited edition volume will also have an exclusive cover, a DVD jacket illustration by anime character designer Yoko Kikuchi, and a special box. More details will be provided in Kadokawa's Ciel and Très Très magazines.

The main story follows the tension between a newly recruited manga editor (Takashi Kondo) and his tyrannical editor-in-chief (Katsuyuki Konishi) — who happen to share a common past. The media distribution site Crunchyroll has been streaming the anime outside Japan since it premiered in Japan last month.