In Tokyo, Shirakawa Yu finds himself transported to the world of Case Closed (Detective Conan). He takes over the intelligence agency and underground forces left by the original owner, becoming an intelligence dealer active in various fields. After a year of running the agency, he discovers that his clients are quite extraordinary: organization assassins, famous detectives, international spies, Tokyo Public Security, phantom thieves, elementary school students, and even a horned girl. His daily life involves occasionally blowing up buildings with an old partner, teasing a cross-dressing phantom thief, and playing detective games with the death-god elementary school student. This is a Case Closed fanfiction, focusing on daily life and humor. It features a semi-dark side, neutral evil, and cunning protagonist.