Rio Kitagawa  

, 北川理央

A girl who frequently teases her teacher, Mika-sensei, due to finding her mood swings endearing. She identifies as a lesbian and has expressed affection for small girls, leading many to speculate about her feelings towards Mika-sensei. Her flirtatious behavior sometimes crosses into inappropriate territory. Kobayashi is envious of her physical appearance. Despite her academic prowess, she isn't above intentionally failing tests to spend more time with Mika-sensei. You can learn more about this character on Wikipedia at .