Youko Sasaki is one of the students from Class 3-2 She has been Yui's classmate since their first year in high school. She is a gentle and quiet girl, but when she becomes fixated on something, the world around her disappears. She is a bona fide member of the Mio Fan Club and also the only one from Class 3-2. Her admiration for Mio knows almost no limits, but Mio's "extremeness", as Ritsu called it, is also too much for Youko to handle.