Urashima is an island that is far apart from the mainland. The people who live there live lives quietly. But five years ago, three large families on the island had experienced serious problems. People on the island cut ties with the mainland. Three girls from each family were the key to saving the island. But they are actually constrained by old traditions that bind them. In this situation, a man who claims to be from the future appears to change the fate of the island.
(Edited from ANN)