One day, Mako, a wife whose husband is soon to be promoted to manager, learns from Yamada, one of her husband's subordinates, that there are many rivals in the race for the promotion... Mako, who had been looking forward to her husband's promotion, becomes increasingly anxious as she listens to the news, and asks Yamada, who seems competent, to look after her husband, but Yamada skillfully tries to make Mako's voluptuous body his own...