Eiji has come to Tokyo to rely on his father, who is working away from home, to attend a seminar at a company in Tokyo. When he meets his father at work for the first time in a while, he is surprised to see that he has been well-dressed and has become a capable man. When he arrives at his father's house, Mai, a subordinate of his father whom he saw at work, suddenly appears from the back room... Eiji then realizes that Mai is his father's mistress, but he is also drawn to the urbane and beautiful mistress of his father...