Ura Island is a southern island far from the mainland. It is a paradise blessed with rich nature. However, this island, which had a complicated past, was about to disappear quietly from history. A young man drifted to such an island. The young man, who claimed to have come from the future, started to fight alone to change the future. However, he had another purpose. The three girls really wanted to know how the island and the world would be changed by him.