Their seemingly perfect married life shatters after a fateful day. The husband, who runs his own company, is betrayed by a trusted friend who swindles him out of a large sum of money, leading to his business collapse. Desperate to return to their former happiness, Ai, the wife, secretly meets with the loan shark. "If you want to save your husband, become my woman for just the weekends!" With the thought of enduring it all for her husband's sake, Ai makes the agonizing decision to offer herself up. From that day forward, a humiliating weekend ritual begins, where she becomes a surrogate sex slave until she becomes pregnant...