The Straight Cop's... Euphoric Undercover Investigation summary: Sergeant Kento Monoga works at the local police office. One day, Inspector Yae of the Crime Prevention Department asks for his help in an undercover operation. Kento accepts the assignment despite his hesitations, but it turns out he needs to be part of a crime group's X-rated party! Kento is overwhelmed by the unusual setting, but, despite his shock, his member gets hard. And then, Inspector Yae tells Kento to fool around with him, to give a convincing performance. So, Kento lets Inspector Yae make him come, as if he were a woman. Kento doesn't know what's happening to his body...!!