Haruko has an argument with her husband over a trivial matter and runs away from home. However, with nowhere to go and feeling lost, she ends up visiting the factory where her son works as a live-in employee. Haruko explains the situation to her son and the factory manager and begs them. Though surprised by their mother's sudden visit, her sons accept her. However, having run away from home in a hurry, Haruko did not bring a change of clothes. In front of her son, Haruko is defenseless and goes braless. However, her son can't help but notice his mother's nipples, which are visible even through her clothes...