Kazuki Tsukigase carries a secret he cannot escape. To find a place where no one knows his past, he transfers to Sakijima High School, located on a remote and isolated island. On Sakijima, there is a location the locals call the Cove of Spiriting Away, a place shrouded in rumors of mysterious disappearances. One early summer day, while exploring this cove, Kazuki discovers an unconscious girl lying on the shore. He rushes her to a clinic, where she eventually regains consciousness. The girl says her name is Nanao and that she is sixteen years old, but beyond that, her identity remains a complete mystery. The only other clue is a single, inexplicable word she whispers: 1974. The narrative follows Kazuki and Nanao as they attempt to unravel the meaning behind this cryptic date and Nanao’s true origins. Their investigation delves into the strange history of the island, a touching boy-meets-girl story that blends romance with supernatural mystery. The isolated island setting, with its small community and haunting coastal locations like the cove, creates an atmosphere of both serene beauty and lingering unease. The central arc involves Kazuki helping the amnesiac Nanao piece together her past, with the recurring number 1974 serving as the primary enigma, suggesting a connection to a different time or a hidden event that took place decades before their meeting.