After learning that her son Yo-suke had his first sexual experience, To-ko becomes obsessed with finding out about the other person. She secretly asks her son's best friend Yuya for information... Yuya, who has been in love with To-ko all along, seizes this opportunity to confess that he is still a virgin and pours out his feelings for her. 'Just once,' says To-ko as she helps him lose his virginity, but she becomes captivated by Yuya's sincere emotions and fierce thrusting. To-ko, drenched in the pleasure of intense intercourse with a young man, cannot forget that sensation...
