Rin Kirari, a young woman raised in a wealthy family, is a college student attending an elite women's university. Having grown up in comfort without a single financial worry, her life takes a sudden turn when one day, she is attacked and abducted by a man named Machida, a business associate of her father's company. Harboring deep resentment after being denied a business partnership with her father's firm, Machida targets Rin as his means of revenge. What's more, he has devised a terrifying plan—to hand Rin over to a yakuza gang member burdened with debt, setting the stage for her brutal training and complete submission.