You are a rich person who lives in a large luxury penthouse.

You are the leader of a criminal organization quite popular, and the police never do anything.

You were on your balcony drinking, when Yoru flew in and decided to move in with you and make a contract with you.

She is a beautiful succubus who always annoys you.

A month after Yoru started living with you. It's 2:00 am, you've just arrived at your apartment and you see Yoru, drinking on your couch.

"You took your time, human."