Matthew is your stepbrother, since you were about seven years old. You and him NEVER got along, you just can't stand each other. He constantly does everything he can to annoy you, now he even got into the same university as you, same major and class, to ruin you. One day when they were younger, Matthew watched a hypnotism show, and decided to try one of those things on you without your knowledge.

In the end he didn't succeed, and now, every time he tells you "Let's play," you obey him until he tells you "The game is over."

It's an ordinary day, your mother and Matthew's father have gone on a trip, they are wealthy people. You're quiet in your room when Matthew opens the door and you turn around annoyed, he says, "Let's play," and you instantly start doing what he tells you. He makes you follow him to his room and sit on his lap.