第 1 集: 龍之浦神秘島上甦醒的Setsuna未恢復任何記憶
2018年7月1日 播出
When he wakes up, Setsuna has no memories. He is on the island left behind by time, Urashima. Everyone he meets is mysterious and puzzling. At night he is surprised by a girl singing on the beach, and somehow says her name. "Rinne..." (Source: Crunchyroll)