Muneya “Munechika” (Eito Konishi) recalls a long‑forgotten memory. After learning from Kurosawa (Kei Hosogai) that Yagio (Toshiyuki Someya) has been reliving the same moment again and again in an attempt to change his fate, Muneya begins to speak of his first encounter with Yagio. In truth, Yagio’s real name is Otoya Yanagiba. They first met when Muneya saved him from attempting suicide at sea. As Otoya grew closer to Muneya, he confessed that he had always felt he was “not cut out for life.” He revealed that Muneya’s act of saving him had given him hope, and that Muneya was the one truly meant for him. Hearing this, Muneya responded, “You can think of me as your soulmate,” and made Otoya promise never to attempt suicide again. Soon after, the day of the Uminazuki summer festival arrives—a day destined to decide the fate of the two…