A school bully who is secretly Rio's lover. She helps lure Tomoko into Rio's clique. After suffering a mental breakdown and revealing a traumatic past of abuse and murder, she attempts to harm Tomoko before jumping to her death from the school rooftop.
Rio and Naoko share a hidden romantic relationship while collaborating on their clique's activities.
Naoko projects her jealousy onto Tomoko, viewing her as the cause of Rio's departure.
Explore the full interactive character relationship map of My Rainy Days