Arashiyama Mari begins a fresh chapter of her life after relocating to a new town, where she enrolls for her sophomore year at St. Louis High School. As an outsider navigating unfamiliar hallways and social circles, she must adjust to her surroundings while forming connections with her classmates. The story unfolds as Mari experiences the pivotal moments of adolescence—friendships, rivalries, and romance—all while settling into her new community.