Toraichi Matsuoka is late father to Gou and Rin Matsuoka, who was a swimmer whose dream was to go the Olympics. He was forced to give up his dream to become a fisherman and married a woman who would give birth to his children. During a storm, Toraichi's fishing boat sunk and he drowned along with his crew, leaving his widow to raise his children. Rin stated that he has very few memories of his father since he was always gone fishing. When he learned his father's dream, Rin decided to become a Olympic swimmer, fulfilling his father's wish.