Ryōta is the protagonist of the series and the childhood friend of Chika, having a crush on her ever since. In the past the two often played together, even sleeping together in the same bed, and promised to marry each other once they had grown into adults. He is best friends with Kōji and good friends with Tsubasa Kawai and often challenges Kōji to see which of the two is better. He enjoys eating and playing games together with the rest of the class. Although he is not very intelligent, he is a kind person and tries to help others when he can, which often unwilling and unintentionally trap him in comprising situations that earn him a beating from either Chika or Yūki. He is naive to the desires of normal males as he is not especially interested in relationships between males and females. Once he falls asleep, not only is it extremely hard to waken him once more, but for anyone who comes into close proximity to him, he will grab them and do something strange to them before they too fall asleep. Not only that, he is also a bad sleeper as he frequently rolls around in his sleep. His seat number is 12. Ryōta Satō is voiced by Hōko Kuwashima in the OVA but is voiced by Yū Kobayashi in the anime.
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