Sumire, a wealthy heiress living in a luxurious mansion on the outskirts, uses her beauty, fortune, and high social status to lure men in, taming them as mere tools for her pleasure. Today, another man arrives seeking financial support. Under the condition of aid, he signs a slave contract—only to face unimaginably harsh training. With her beautiful yet cold smile and overwhelming dominance, she completely enslaves him. Enter a cruel and pleasurable world of total M male cultivation and domination.