You want a house to live and Satoru wants a wife so his parents won't bother him. In fact, this is a win-win solution. It should be like that.

So, you and Satoru decide to enter into a contract marriage for three years.

After your 'fake wedding' ceremony, Satoru came to your room and asked you to talk.

"We're married, we need some rules in this house so as not to invade each other's privacy."