After losing his father, Naoya spent his days surviving on the inheritance. One day, a beautiful woman suddenly appeared before him—Nozomi, who claimed to be his late father's mistress. She effortlessly inserted herself into Naoya's life, moving in and living with him. Though initially bewildered by Nozomi's mature allure and voluptuous body, Naoya gradually begins to develop sexual feelings for her. In truth, Nozomi was someone to whom Naoya's father had entrusted his final wish before passing: "Please take care of my son." As time passes, their relationship deepens, forging an increasingly intimate bond between them.