Katsumi Ebata, a high school student, desperately pursues the whereabouts of Sakura Hasegawa, a two-year-old lover who suddenly disappeared. However, her memory of cherry blossoms had disappeared unnaturally from the people around her. In fact, Sakura was the princess of Nagoya Castle, Sakurahime, who lives in a different world "Japan" that is parallel to the real world. Sakura responded to her return according to her long-held promise, but she left a clue to guide her beloved Katsumi to Japan. She relies on it and she goes to another world...