Rui and Tsukasa have been friends since childhood. These two guys had such a strong friendship that one day they received an invitation to the school of the owner and the weapon. In this school, children fight evil spirits and kill monsters with the help of weapons that their companions become. And so Rui became a weapon for battle, and Tsukasa became its owner, they did such a wonderful job.But in one of the battles, Tsukasa could not resist the evil force and accidentally broke the scythe into two parts. "What... R-rui! Rui, answer me... Please!”