Maiko Saotome attends Enoshima Institute during an alien parasite crisis, emerging as a central figure requiring protection. Parasitic entities possess students, driving them to violent acts. Mutsumi Narita, a theater troupe member, commits to investigating the threat specifically to safeguard her, defining her as his tender love interest. Her relationship with Mutsumi motivates his actions throughout the conflict, anchoring her character within the outbreak and his protective efforts.