When three high school girls on a school trip wake up, they find themselves on a strange uninhabited island...! Nanami, the class representative who cares about her mother, Masami who is the ace of the soccer club and has a good mood, and Honoka who is a popular idol and has a high pride. The three do not know each other even at the same school, but they gradually open up to each other through their lives on the island. But salvation does not appear out of nowhere. No one knows why they were brought here...