Furude Riku is one of Rika's ancestors, also the Heir and the Shinto Priest of the Furude House. He fell in love with Hainiryuun, and they later had a child together, Furude Ōka. He was the reason that Hainiryuun was nicknamed "Hanyū," because he had a hard time trying to remember and pronounce her name so he shortened it to Hanyū. He was voiced by Tomokazu Seki. Riku has a polite yet bold and playful in personality, never having feared Hanyū for her horns and even giving her a nickname upon their first meeting. It is later revealed that he was the infant that Hanyū had rescued 20 years prior.