Yamashita is brought to the home of his boss, Takaoka, who loves to drink. While hanging out with a drunk Takaoka, he misses the last train... He has no choice but to stay the night, but when he meets Takaoka's wife, Satsuki, he is captivated by her. Meanwhile, Satsuki, who is frustrated by the lack of sex with her husband, is secretly masturbating... Yamashita, who is watching, is turned on by his erect penis and can't help but approach him. Enamored by her, Yamashita is forced to visit the Takaoka house again for business...