Based on a manga "Go-toubun no Hanayome" by Haruba Negi. In the game, the Nakano quintuplets, protagonist Uesugi Fuutarou, and Fuutarou's younger sister Raiha went to the Nakano's private island during the summer break only for three days and two nights. But due a heavy storm, the group is unable to going back and has to spend 2 weeks in the island.

The continuation visual novel version of the franchise's online puzzle game. Contains 23 Gotopazu's original event stories and as well the visual novel adaptation of anime's second season.