The main character, Haruta Kirimiya is the only son of a wealthy couple who lived in a tower block since he was young, and is enrolled in a prestigious private school but is currently semi-reclusive.
His father, Yoshio, who is an elite employee of a large company, concludes that his son is being bullied because he is short and obese, and he despises his son, a "loser," so much that he devotes himself to work, ignoring his family.
On the other hand, his mother Mizuki , who was raised as a naive young lady, dotes on him, but she lacks knowledge about the growth of boys and treats him more like a child than his actual age. He had a cold hatred for his father, and a dark and twisted love for his young, beautiful and attractive mother.
He may be like that, but in reality, he didn't live a life that would make his parents feel pessimistic. After all, he hasn't actually been bullied, and for several years now he has been day trading, giving up his school time, and has acquired a huge amount of assets. He has good relationships with his friends, and is able to obtain most of the things that money can buy. But now, he has given up, saying, "No matter how much money you have, it doesn't necessarily mean you'll be happy.''
What he really wants is not money, but Mizuki, a mother and a woman. One day, he notices that Mizuki, who usually acts cheerfully, is looking haggard. Mizuki says there is something she would like to discuss with Yoshio, but Yoshio says, "The company's project is reaching its climax and I am busy,'' and her son is unable to approach her. Late at night, using Mizuki's finger, who is asleep from crying, he breaks through the smartphone's fingerprint authentication and registers his own fingerprint.
The next day, while Mizuki was taking a bath, he checked her smartphone and learned from her email and SNS history that his beloved mother had fallen victim to an investment scam and owes millions of yen. Furthermore, he learns that the reason she fell for the scam was because she tried to give her husband a luxury watch, which is his only hobby.
Yoshio was in charge of all his own income and only gave Mizuki the amount of living expenses for his needs, so as a housewife, she didn't have any free money. As he explodes with hatred towards his father, and her husband, he realizes that his love for his mother, Mizuki, is becoming even more distorted....
With his financial strength, it would be a no-brainer for him to shoulder Mizuki's debt. Driven by passionate feelings, he comes up with a plan and pretends to be a fictitious wealthy man, "X'', and sends a threatening email to Mizuki saying, "I am a pervert who gets excited by watching a real parent and child having sex. If you send me a video of you having sex with your son, I will take over the debt depending on the content. If you report it to the police, I will reveal the debt to your husband.''
He then deposited a percentage of the debt into Mizuki's bank account as a deposit. He feels a dark sense of joy as he sees Mizuki clearly upset the next day. Then comes the night of the video trade deadline. Mizuki stealthily sneaks into his room, holding her breath as his chest and cock almost burst with excitement. Those fingers gently touch his rising desire...