After a disastrous school trip, Homare Onishima, Shion Kujou, Asuka Suzumori, and Mutsu Amatani are stranded on an uninhabited island. Unlike the others who are scared and hopeless, Homare remains oddly composed, thanks to her past experience of being stranded. Trained by her survivalist father, Homare has honed skills such as cliff climbing, prey trapping, shelter building, and even devouring nutrients from moose genitals. For her, staying alive on a deserted island is simply child's play, while the others struggle. Homare relishes in her unconventional survival methods like ingesting fish blood and munching on cicadas. She guides her classmates towards understanding that being isolated may not be as dreadful as they anticipated.