The main female lead, who has to attend an all-boys school in place of her twin brother due to him running away from school. She does very poorly in school, due to the fact that "stress" causes her to daydream and she therefor does not pay attention in class, though she gets tutored by Itou and quickly improves. After being saved multiple times by Itou, she declares his love for him, though he is too embarrassed at the time to respond to the confession. At the end of the series she switches back with Akira, deciding to take a new first step in her relationship with Itou, as a girl.