The Detective Is Already Dead

Sinopsis

Kimihiko Kimizuka became the assistant to a mysterious detective named Siesta after they met on a hijacked airplane four years prior. Together, they traveled the world, engaging in complex adventures and fighting a secret organization, until Siesta's death separated them. Now, Kimihiko is a high school student attempting to live a normal life, but circumstances prevent him from doing so, despite the detective no longer being alive.