Following a plane crash during a school trip, Oribe Mutsumi and her classmates are stranded on an island that appears deserted. Mutsumi locates the other survivors and applies her wilderness skills to assist them. She anticipates rescue within approximately three days, a duration that does not seem overly difficult to withstand. However, she fails to consider that the island is inhabited by gigantic killer insects. Her expertise regarding butterflies, wasps, and other species may be the sole factor enabling her classmates to survive until rescue arrives.