Kamiizumi Rio

A gravure-style figure with large breasts and hips.

She has worked as a model since childhood, making full use of her beauty.
A charismatic presence, she draws admiration and envy from girls her own age.
Recognizing her influence, Arisa positions her as the one who actively and directly 'teases' the protagonist.
Her manner of speaking is typical of a trendy modern girl—light, flashy, and very much in the style of a so-called "DQN gyaru"—but beneath that image, she is highly intelligent and academically capable, with a calculating nature.
Put less kindly, she can be described as 'cunning', and her relationship with Arisa is one of mutual manipulation.
However, this doesn’t go unnoticed by Arisa's secretary, Yuriko, which leads to tension between the two—they don’t get along well.

"Why are you trying to close your legs on your own? If you don’t stay still, I’ll crush you!"