"Ginka, a childhood friend, on the night of the summer festival, was "spirited away" and disappeared."

5 years have passed since then.

Now a high school student, Aoba Ryuusei boards a ferry returning to Himejima. He wants to make sure. Since then, what happened to Ginka? Maybe, she returns home like nothing has happened, living a normal life and attending school on the island, perhaps......

Such small expectation turns into disappointment. Ever since that night, Ginka remains missing. Sinking into despair, when Ryuusei is about to leave the island again, he has a mysterious reunion. What appears before him is a girl who looks the same like she was back then―― Ginka.

"Welcome back."

Forgotten even her own name, all Ginka remembers are the name "Ryuusei" and the feelings she has for him. Where has she been? Why does she still look so young? On a small island where time flows leisurely, days with a childhood friend who has been "spirited away" and returned, in a summer vacation like a fairy tale.