Riko Suminoe

Riko Suminoe is one of the main characters of the series. She is a second year student and the younger twin sister of Ako Suminoe and older step-sister of Keita Suminoe. Riko has tuscan red hair worn in a long thin ponytail with shoulder-length forelocks framing her face and amber-brown eyes. Riko is mostly seen wearing an adhesive bandage under her left cheek. Unlike Ako Suminoe, Riko is less academically accomplished who gets worse grades than Ako in her studies as she thinks passing tests is dependent on luck, but she is very active in physical activities that she sometimes helps out with various sports clubs that need a temporarily player for training and she is a terrible cook. She has a habit of answering truthfully but very bluntly, causing everyone else to jump to conclusions. She is much shyer in person than her sister, as she cannot kiss Keita in front of anyone else; Miharu Mikuni states that Riko has more common sense than Ako. She is the head student in charge of punishing other students on the disciplinary committee at her school, where she uses a shinai to punish the students. In school she is known to have a stricter personality, yet just like her twin sister will abuse her authority to get Keita alone with her. She is also the more manipulative of the siblings, as clearly seen in chapter 48 where she uses just the right moves to seduce Keita. Yūzuki Kiryū also notes this when she saw them kissing, stating that Riko is in complete control of Keita. However, she only shows this special nature when she is alone or with only Keita.