Let's☆Lagoon

Yamada awakens stranded on a remote, deserted island where no ships ever pass. With his memory clouded and no recollection of how he arrived, he is left to piece together the circumstances of his sudden isolation. Upon discovering his sports bag washed ashore nearby, he deduces that he must have been participating in a school trip before disaster struck. Armed with only seven days' worth of food, Yamada realizes the grim reality of his situation and resolves to construct a makeshift boat to escape before his meager supplies run out. Just as he resigns himself to surviving entirely alone, his solitary existence is abruptly shattered when he discovers an unexpected intruder: a girl named Imaise Chika, who has been quietly eating his precious rations. This surprising encounter upends his desperate survival plans and introduces a new dynamic to his castaway ordeal, forcing him to navigate both the harsh environment and the mystery of his unexpected companion.