Riki Katsuo, who looks tough but is a coward and was bullied in middle school, enrolls in Hanazawa High School to start anew. Riki walks with a gun, believing that the first step is the most important thing, and with a strange look on his face, he drives away a man who tries to pick a fight with him. Ishida Tetsutaro, who saw this, asks him to become his underling. For the next three days, Riki lives a rosy life, but then a muscular guy with glasses challenges him to a duel...!?