Following a plane crash on a remote island during a school excursion, Oribe Mutsumi and her peers find themselves in a struggle for survival. Utilizing her wilderness expertise, Mutsumi leads the group in navigating the challenges of the island, anticipating a swift rescue within three days. Little did she anticipate the threat posed by monstrous killer insects inhabiting the island. With her specialized knowledge of butterflies, wasps, and other creatures, Mutsumi becomes the key to her classmates' survival until they can be rescued.