Her father evaporated and left her with debts, and her mother collapsed from overwork, and in order to earn enough money to pay for her hospitalization and raise her younger brother, she resorts to compensated dating just once. - Her first partner is a gentleman and kind middle-aged man. She trusts him and introduces him to an acquaintance of his, and they continue to have a compensated relationship. - The man pretends to be a gentleman in front of Mana and slowly trains her into a perverted middle-aged woman.