In that warehouse, dropouts who had been rounded up by the Yakuza were forced to do forced labor. The men were worn down physically and mentally every day, reaching their limits... One day, Yui, a part-time delivery girl from a cheap lunch delivery shop that delivers lunches once every three days, arrived. The men, who had been deprived of a woman, pinned Yui down and humiliated her to the fullest. Since then, they have been slowly eating away at Yui No Kokoro, corrupting her into a tool for sexual satisfaction. Soon, the Yakuza who was in charge of the place showed up...