Having lost his mother before he could even remember, and raised by a single father, Shinji is Kokoro to his friend's mother, Miki , and falls in love with her. However, he is unable to release his feelings on his own, and ends up consulting her. Miki teaches him about sex, one step at a time, as he has yet to experience puberty. Feeling pleasure for the first time, Shinji forgets what to say and continues to swing his hips in a frenzy. As he desperately devours her body, Miki's body is soon unable to withstand the waves of orgasm that wash over her...