Shimizu Mayuri

A girl with a mysterious aura, who is always on her own reading a book. She doesn't say or show much of herself, but she still feels emotions, and her personality is pure and honest.
Ever since she was a child, she was prone to illness and did not have much opportunities to talk to others, which degraded her social skills, and thus she became obsessed with reading.
Despite being a first-year, she still has a mature body, but due to her upbringing, is mentally very lonely. She has read a lot of books, and so she has a good amount of knowledge about sex, but is mentally too young to be interested, and never even masturbated.