Synopsis

A man washes up on the remote island of Urashima with complete amnesia—except for one thing. He knows he's a time traveler, and he's here to save someone. When he meets Rinne Ohara, her song triggers a memory of the name "Setsuna," and he decides that's who he is. Rinne recognizes the name from her own past and brings him home as a servant, hoping he's the person she remembers. Meanwhile, Setsuna starts piecing together Urashima's secrets: its folklore, its three powerful families, and a mysterious disease that traps people indoors during daylight. As fragments of his memory surface and the island's problems pile up, Setsuna realizes his real dilemma. He came here with a mission to protect one specific girl—but the more he learns about what's actually happening on Urashima, the less certain he becomes. Is he really just supposed to save one person? Or is there something bigger at stake?

Content compiled by AnimeList.moe from publicly available sources.

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