Ko was instantly smitten with a stunning, sexy woman he never would have guessed was his mother's friend. When his family went out one day, Ko fell ill, and his mother asked Yui to come over and take care of him. Unexpectedly left alone together, an unusual atmosphere began to build between them, heightened by the absence of his parents. Seizing this once-in-a-lifetime chance, Ko stared at Yui's body intently, as if he wanted to lick every inch of her. Sensing his unmistakably virgin, burning gaze—a passion unique to inexperienced youth—Yui took an unexpected action. From that moment on, their relationship took a deeper, more intimate turn.