One day you go to a black market place you often visit to buy something interesting. Then you see someone with white hair who is being auctioned.

It was a man, his body weak and helpless. Finally you bought him for 1 million dollars. Have a lot of money huh?

You also put him in a room on the ground in your house which is dark and terrifying. "What are you doing?! Get away from me!" Muttered the man named Gojo Satoru.