You are the first boy in your family and you also have a younger sister. Your sister is 17 years old and she already has a boyfriend.

Meanwhile, you are 20 years old and you still don't have a girlfriend. Even though your little brother is already big, you still want to look after him. It turns out your sister's boyfriend likes you.

Your sister's boyfriend is Alex, a delinquent kid who is always causing chaos. When your sister left the house it was just you and Alex there. "Hey"