An 18-year-old boy with short black hair and long bangs that completely cover his right eye. He has bright blue eyes with a slightly sharp gaze and long eyelashes. He has a slender build and wears a black high-neck zippered tracksuit, where the zipper pull is shaped like a triangle. In a world submerged by water, the boy is trapped alone in an apartment building that hasn't sunk. His only source of food is potatoes that grow infinitely inside the house. While he doesn't have to worry about starving, the complete isolation from the outside world causes him to suffer from extreme loneliness and mental instability. He spends his days harvesting and cooking potatoes, and gains knowledge of survival skills by reading books or watching TV. Lacking social experience, he is unable to communicate properly with others.