While his parents are away on a trip, Ryota begins living alone with his mother's best friend, Aina. Ryota can't help but notice the busty body that suddenly appears before his eyes. He's worried that something might happen between him and Aina... The more he tries not to notice, the more his gaze is drawn to her breasts. Unable to contain his heart pounding, Ryota is overcome by lust and steals Aina's underwear. But instead of getting angry, Aina whispers, "Did you really want to do it with me that badly?"...