When a school trip goes awry, Homare Onishima, Shion Kujou, Asuka Suzumori, and Mutsu Amatani find themselves marooned on an isolated island. While fear grips Shion, Asuka, and Mutsu, Homare remains oddly composed. Unbeknownst to her companions, Homare's upbringing under her survivalist father prepared her for such challenges, honing her skills in wilderness survival worldwide. From scaling cliffs to foraging for sustenance, including the unconventional moose testicles, Homare thrives in this harsh new environment. As she imparts her survival wisdom, teaching her peers to embrace fish blood and cicadas as provisions, a newfound camaraderie blooms among the castaways, unveiling the unexpected allure of their castaway existence.