Shuuichi is a young trans girl who is one of two main protagonists. She is a fifth grader at the beginning of the series. As she grows up and hits puberty, she becomes increasingly concerned about the way her body is changing. Shuuichi has an honest and dutiful personality that generally makes it easy for her get along well with others, though she can also be quite sensitive at times. She is often described as cute, and is able to pass as a girl due to her feminine appearance and physical build; she enjoys wearing cute clothes, which her friends encourage. Shuuichi later becomes interested in writing stories, and joins the drama club as a writer.