Iihara Nao

A female student at the school.

She is a cousin of the main character and Toruko. When she was a child, she was weak, she was in and out of the hospital where the main character's parents lived. She is healthy now. The protagonist used to take good care of her.

She has had feelings for the protagonist since then, and still adores him. Although she is always fidgety, she has a positive and kind-hearted personality.
She is a stubborn person who goes at her own pace. She is also a clumsy girl.

She is more worried about her own pace than herself. In reality, however, Mitsugu follows her when she tends to go out of control.