Mizuki Takigawa
A serious class rep who gets good grades. Her strong sense of duty means the boys are mostly scared of her. On the surface, she's the polar opposite of her childhood friend Hajime, and seems to be the one who keeps him in line. However, the pair have engaged in mutual masturbation for a while now. Mizuki is especially weak to dirty talk. Though she often tells Hajime off for his rough attitude, she doesn't exactly dislike it.
She has a crush on Sakaki, but knows about her fearsome reputation and doesn't have the confidence to approach him. Sakaki and Yuma's blossoming relationship depresses her a bit.
Mizuki has a surprisingly good figure, but nobody notices because they're so put-off by her. She has a complex about a mole on her intimate region.