Saezuru Tori wa Habatakanai: Dont Stay Gold  

Saezuru Tori wa Habatakanai: Don't Stay Gold, Twittering Birds Never Fly: Don't Stay Gold, Saezuru Tori wa Habatakanai OVA, Twittering Birds Never Fly OVA, 囀る鳥は羽ばたかない Don't stay gold

Eishin Kuga, also known as "Mad Dog," is a young man with an intense bloodlust who beats up his subordinates. Yashiro observes the scene and waits for Mad Dog to tire himself out before taking him down. Meanwhile, Kanji Kageyama, an underground doctor, meets Mad Dog at last after being tasked by Yashiro to recruit him into his yakuza group. However, since Mad Dog is not interested in joining Yashiro's organization, Kageyama must temporarily house him. Despite this, Kageyama may find himself swaying towards men due to Mad Dog's shirtless physique, boisterous personality, and constant teasing.

Dont Stay Gold is an adaptation of the short story of the same name by Kou Yoneda. The OVA was included with the limited edition of volume 7 of the Twittering Birds Never Fly manga in Japan. It was licensed in English by Sentai Filmworks and premiered on HIDIVE on September 10, 2021.