The story takes place on the remote island "Urashima". Although the scenery there is picturesque and the folk customs are simple and free, the indigenous people who have lived there for generations are restricted by what has happened in the past and the ancient red tape. As time goes by, the residents who can't see hope for the future begin to give up on themselves. One day, a man named Michiri Kirina (voiced by Suzuki Tatsuhisa) was washed onto the beach by the waves. He lost important memories and only knew that he was carrying the mission of saving the world. On the island, Kirina met Mihara Rinone (voiced by Tamura Yukari), a stubborn homebody who only goes out at night, Shuto Karen (voiced by Asumi Kana), who has a carefree and boyish personality, and Garando Sara (voiced by Yamamura Hibiki), who has a tragic life experience and a strong sense of inspiration.