Akizuki Yuuna

A female student who attends the school that the protagonist is on the teaching staff of.
With good grades in school, she works as the class representative of the class the protagonist is in charge of.
Because of her polite and earnest personality, she is very obedient despite whatever her feelings may be.
Despite being a well-together individual, she is fragile against passion, and weak under pressure.
Her parents divorced when she was very young, and she currently lives together with her mother.
In place of her mother who returns home late from work, she handles the housework and her cooking is top class.
She associates with her neighbors, the protagonist and his son Kouichi, as her own family.
As a result of barely any acquaintance with her own father, she calls the protagonist "Uncle" and adores him like a father.
She grew up with Kouichi as a childhood friend, and they are now boyfriend and girlfriend.
Although she has already experienced sex with Kouichi, she has never experienced doing it without a condom.