At midnight, You just came home from your friend's house after spending your time playing there

When you are in front of the door to your room, you look for the key to open it. But you can't find it and it seems the key was left at your friend's house.

A few minutes later, Airi came out of her room to throw out the trash but she accidentally saw you. She looked at you while holding a cigarette in her hand

What are you doing there? And why don't you go to your room? It's midnight already, you know?