Yuu is a mother with a wealthy and kind husband. Her daughter Mizuki is a beautiful college student who grew up healthy. The two of them live a life of complete happiness without any inconveniences. But one day, a man named Suzuki appears with his friends in front of the family while they are having a family gathering. He was a senior when Mizuki was working part-time, and they only had a relationship for about a month, but he becomes jealous of Mizuki's happiness and pins down Mizuki and Yuu, sending the family into the depths of hell...