A high school boy whose father is the chairman of the Higashiyama Group, a large corporation involved in the development of railroads, department stores, and resort facilities, plays the leading role in a romantic survival game. As the son of his father's 23rd mistress. Despite this, he's suddenly chosen as the next chairman of the Higashiyama Group.
Mistress must fulfill their role and satisfy their master´s needs, it´s strictly forbidden to fight and cheat one another.