Is it possible for fishing to be the solution to saving the world? Yuki Sanada is a socially outcast individual who struggles to fit in anywhere he goes. In search of a fresh start, he and his grandmother move to Enoshima, a coastal town. But his plans to start anew are thwarted when a transfer student named Haru arrives, claiming to be an extraterrestrial and forcing his way into Yuki's life. Haru assigns Yuki an extraordinary task - to save the world from an unknown threat in the ocean. Natsuki Usami, an expert fisherman, becomes Yuki's unlikely ally in this comical escapade, which is laden with mischief, comedy, emotion, and self-discovery.