Hitomi is asked by her husband's friend to tutor his son. Being unable to refuse, she begins teaching Kouichi, who is currently in his second year of ronin studies, helping him with his academics. However, Kouichi becomes increasingly distracted by Hitomi's breasts, thinking about nothing else but them. Eventually, he goes as far as asking Hitomi if he can touch her breasts. Once she starts giving in to his request, his desires continue to escalate uncontrollably...