Arihara Sayaka

She is the only daughter of the founder of the company where the main character works, and the wife of the current president who has taken him as his son-in-law. She is a calm, elegant, and chaste wife who grew up as a young lady.

Her husband married her for the company's sake, so after her father, the chairman of the company, passed away and leaving her with no one to look after her, he left her alone and devoted himself to look for a mistresses.

She has little experience in sex, but she is in agony every day because of her ripe and mature body. Her sexual desire was awakened when she was accidentally molested by the protagonist on the train, and after that, she was swept away and awakened to lewdness and perversity.