The Detective Is Already Dead anime
Kimizuka Kimihiko can be a crisis-magnet. Kimizuka Kimihiko is a crisis-magnet. He has been involved in numerous criminal investigations and even witnessed a drug deal. It is not surprising that his seemingly mundane flight suddenly becomes a situation of emergency, with the need for a detective. His attempt to avoid trouble is foiled when a beautiful girl with silver hair, codename Siesta, stops him. Kimizuka is unceremoniously dragged into the case by her detective assistant.
This incident was the start of a journey around the world that would go beyond what he could have imagined. They risked their lives to save thousands of lives and stop criminal organizations. The curtain fell on their incredible journey when Siesta died three years later.
Kimizuka resolves to lead a normal high school life, and keeps a low profile for a year. As fate would have it though, Kimizuka is confronted by a girl who has a striking resemblance with Siesta and threatens to disrupt his peaceful life.