KissxSis: Riko Suminoe

Riko is the youngest of the twins. She is also the head of disciplinary committee, where she uses a bokken/shinai to punish the students, and she has a stricter personality. While it is shown that both she and Ako have a lust feeling her Keita, Riko is shown to be lustier, as she once sneaked into Keita's room and slept with him (and by that i mean normal sleep and not that kind of sleep)