Sasaki Reina

Aria's childhood friend. She is calm, quick-witted, calculating, cool beauty. In fact, she is a bit of a pushover, and is not very good at dealing with unexpected situations.

She is not good at social group interactions, which women are typically good with, and does not care if she is not well-liked by her own gender.

She's jealous of her childhood friend whom she met again. Aria tells her of all the things she has done sexually, that she herself could only dream about. She secretly wants to see Aria have sex in person.

Prior to meeting Aria again, she would routinely masturbate to release her tension using her vast erotic knowledge. She learns that the protagonist she is interested in has sexual experience.

Not being able to stand the thought of masturbating alone anymore, she confesses her love to the protagonist and proceeds to take his dick in her mouth.

When it comes to sex, she believes that it is important act to maintain oneself (She doesn't really know, since she's a virgin).