Tantei wa Mou, Shindeiru. S01

Kimizuka Kimihiko is a magnet for trouble. From getting caught up in a crime scene to stumbling upon a drug deal, trouble seems to follow him wherever he goes. So it's no surprise that his ordinary flight would suddenly turn into an emergency situation, requiring a detective on board. Unfortunately, his attempt to avoid trouble was thwarted by a silver-haired girl who goes by the alias Siesta, who introduced herself as a detective and bluntly dragged Kimizuka into the case as her partner. That incident marked the beginning of a grand adventure around the world, something Kimizuka never could have imagined. Both of them, aware of the danger to their lives, spent their time destroying criminal organizations, preventing disasters, and saving people. But three years later, with Siesta's death, their journey came to an end. This time, Kimizuka decided to live a normal high school life. He lived in hiding for a year. But fate brought him together with a girl who was eerily similar to Siesta, an encounter that would challenge his peaceful life once again.