The novels for the supernatural anime by acclaimed director Kunihiko Ikuhara (SailorMoon, Revolutionary Girl Utena, Sarazanmai). Twins Kanba and Shoma live with their terminally ill little sister, Himari. One day, they visit the aquarium, a place full of warm memories for Himari, but she suddenly falls ill - and dies! At that very moment, a voice cries out, "Survival Tactic!" and Himari, wearing a penguin hat, comes back to life...?