Quiet, serious and secretive, Miyu is Noeru's roommate. She's a bit of a loner and sometimes stays out until very late at night. At first, she appears unfriendly to Noeru, but eventually becomes good friends with him when he helps her with her 'bug problems', which - unbeknownst to her - is actually a prank Noeru thoughtlessly pulled on her. Miyu, despite what people think of her, is actually a very nice and pleasant girl.
There are many rumors about her circulating in school, like her involvement with a much older man. While she seems apathetic to the issue, Noeru becomes worried and even goes as far as to spy on her during one of her gimmicks, bringing a disgruntled Sasa with him. When things are eventually settled, Noeru - with the help of Maria - realizes that he may actually like Miyu as more than a friend, and surely, Miyu becomes the girl who is able to distract the main character from his unhealthy obsession with his sister. However, Miyu, due to a past experience, holds a deep resentment toward liars, which poses as a huge problem to cross-dresser Noeru and his growing feelings toward her. It is also discovered that she and Sasa share something else than a school later on in the story.