In the World of Case Closed: I Become Ai Haibara’s Fiancé

He transmigrates to a world of science and becomes the first customer at Café Poirot.

Right from the start, he accepts Akemi Miyano's request to infiltrate the Black Organization and become Shiho Miyano's fiancé, ideally helping her escape the organization and live an ordinary life.

He gets into the organization, and when Gin puts him to the test, Yagyu's first move is to report Dai Moroboshi, the man Shuichi Akai is impersonating.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.