A married couple approaches a man for financing, but he insists on first evaluating the wife's character and personality, requesting a meeting at a hot spring resort. The loan terms include a clause making the wife the collateral. At the resort, they face a lewd session in the form of "training," where the wife's reactions and compliance become crucial. Set in a sensual, intimate environment, this film depicts how the couple's relationship transforms under pressure, as humiliation and eroticism intertwine.