Saitou Mizuki

Mizuki Saito (nee Himuro), 29, works for a foreign pharmaceutical company. She is a talented older sister with big breasts and good looks.

She is an medical representative at a pharmaceutical company. She often has affairs with doctors for the sake of sales performance.

She has been married for two years. All of her previous boyfriends were younger than her. She likes younger men.

Spoiler

Is secretly a slut that has stolen a lot of men's virginity since high school including many of her husband friends/coworkers. Was aware of her brothers crush and secretly wanted to have sex with him as well for fun.