After graduating from industrial school, young Saburo starts working at an auto repair shop and, through the recommendation of the company president, moves into a boarding house run by a folk song teacher. The landlady is a beautiful woman in her forties who kindly takes care of Saburo's daily needs. Gradually captivated by her warmth and sensual charm, Saburo is one night persuaded to drink alcohol by the landlady. That evening, she deliberately exposes her naked body to him while bathing, seducing him. Drawn in by her beauty and tenderness, Saburo succumbs to her youthful, passionate advances, climaxing repeatedly as he desperately seeks her body. Their intimate relationship continues to deepen from that night on.