Kaito Saejima, a survival-obsessed high schooler, suddenly finds himself transported to an uninhabited island in another world—along with his entire class! With dangerous wildlife, scarce resources, and no way home, survival is a challenge for everyone... except Kaito. Using his expert survival skills, he quickly becomes the group's most reliable leader. As he hunts, builds shelters, and protects his classmates, the beautiful girls around him start depending on him more and more—leading to a carefree yet action-packed survival harem life!