When Bell Cranel and the rest of Hestia Familia receive a quest to retrieve rare medicinal herbs from a deserted island, they decide to use the opportunity as a vacation to recover from the recent events. Upon their arrival, the situation quickly escalates, as the girls start quarreling for Bell's attention. However, with the unexpected appearance of a familiar face and other strange occurrences beginning to happen on the island, the group must find a way to endure the abrupt hardships.