Kokona Tagawa is a student from class 3-B at Kunugigaoka Junior High School. She was originally a character in the manga who was not adapted into the earlier television series and makes her first animated appearance in the film Gekijōban Ansatsu Kyōshitsu Minna no Jikan. Her background establishes her as a former classmate of Meg Kataoka. A defining incident from their shared past involves Kokona nearly drowning after failing to learn how to swim. She subsequently uses this event to manipulate the guilt Meg feels, pressuring Meg into providing her with academic tutoring. This action defines her personality as pragmatic and self-interested, willing to exploit emotional leverage to secure her goals, specifically academic improvement. Her motivations stem from a desire to advance her own standing through leverage over her former classmate. Within the story, her role is to serve as a supporting character who illuminates the wider school environment and social pressures, acting as a contrast to the extraordinary circumstances of Class 3-E. Her key relationship is with Meg Kataoka, through which the narrative explores themes of guilt, obligation, and Megs personal history. Kokona's development is tied to the confrontation of these themes and the resolution of her demands. Unlike the students of Class 3-E, she has no notable combat or assassination abilities; she is characterized entirely by her ordinary student life and her capacity for social manipulation.