Owaru Endou was the most powerful hitman employed by the massive underworld organization known as the Fujiyama Group. His robotic demeanor and total lack of hesitation when committing ruthless acts had earned him the nickname "Fujiyama's Killing Machine." His presence alone acts as a deterrent to Fujiyama's enemies, but the only thing anyone knows about him is his name. He was a legend. However, he decided to quit. He found a new way of life to support Kaorin, a member of Rosaceae, an "underground" idol group. He started to think that a murderer like him would never have the right to be her fan. Original T-shirts, Instax events, trading original photo cards... Can Endou stan Kaorin while he is preoccupied with hitman's rules?