An erotic drama in which Hiraishi Kazumi captivates with her powerful body. 1970, Tokyo. A female mahjong player calling herself Yoko appears at a gambling hall. Yoko repeatedly cheats by posing seductively to the men. The heated men pull knives on Yoko. Akira, who has seen through Yoko's cheating, comes to her rescue. The two, who are similar in kind, soon become one another...