Tokumu-ka no hoshi: Mitsu chichi cosplay dai sakusen!

特務課の星 蜜乳コスプレ大作戦！ (original title)

Synopsis

With the teachings of her instructor Hamaguchi in mind, Mami became a Special Task Force investigator of the Tokyo Metropolitan Police to solve mysterious cases with her cosplay disguise skills. However, her joy is short-lived as a strange phenomenon occurs in which a man suddenly turns into a gay man...