Riko is a modest, down-to-earth second-year transfer student from Akihabara's Otonokizaka Girls' Academy. She is a talented young pianist, but felt that she had stopped improving, and moved to Numazu to take inspiration from the sea. She is also a capable violist. She has a fear of dogs, which is not helped by the fact that the Takami family's dog, Shiitake, seems to take an interest in her. She eventually gets over her fear of dogs to the point that she now loves them, and adopts her own puppy by the end of the series. She is also revealed to have an interest in various shojo and yuri manga, often buying collections on her brief returns to Tokyo. After joining Aqours, she becomes the composer of the group. her voice is plain like Hanamaru's, but higher in pitch, please don't strain! :)