Akemi Mikihara is a twelfth-grade student who serves as captain of her school's tennis club. She secretly maintains a romantic relationship with the club's faculty advisor. She shares a friendship with Mio Serizawa and has an antagonistic relationship with teacher Takashima Kumi. Akemi has blond hair, pale skin, and a slim build. She is typically seen in her school uniform with a string ribbon tie, and also appears in a swimsuit. Her personality is marked by secrecy, dishonesty, cowardice, selfishness, and talkativeness. She becomes trapped with others inside an abandoned school building, where the central conflict involves navigating the confinement, avoiding capture, and seeking escape.