Katsumi Kudo is a male Japanese student at the school, characterized by his brown hair and brown eyes. On the main character's first day, he repeatedly collides with her accidentally. During these encounters, he exhibits courteous and gentlemanly conduct. He later intervenes to protect her from harassment and sexual assault by a group of female students, demonstrating his chivalrous and protective nature. Katsumi appears to hold some influence within the school, though its exact source remains undefined. Despite his connections, he lacks awareness of Yurika's clandestine activities.