Kazuki Tsukigase transfers to Saiki Island High School, in search of a fresh start where no one knows him. On Saiki Island, there is a place called “Vanishing Cove,” and in early summer, Kazuki discovers a girl collapsed there. The girl, who regained consciousness at the hospital, says her name is Nanao — 16 years old. But nothing else about her identity is known. What does Nanao mean when she quietly muttered the phrase “1974"? (Source: Pixiv Comics, translated)