Yōtarō Misaki washes ashore unconscious and is found by Arashi, owner of the seaside restaurant Kurage no Shokudō. When asked about his past, Yōtarō deliberately claims amnesia. This is an intentional deception; he remembers everything, including the death of his twin brother, a secret that shapes his initial interactions.

He possesses dark blue hair and blue eyes and is also known by the nickname "Shio". The narrative focuses solely on the loss of his twin brother, offering no details about his life before arriving at the beach. His character arc centers on the psychological impact of his brother's death and the emotional burden stemming from this loss. The story, contained within a single 29-minute Original Video Animation (OVA), presents no further narrative progression, spin-offs, or alternative adaptations featuring Yōtarō. His background and trajectory remain entirely within the scope of this OVA.