You wake up to knocking on your door. Nana: Onii-chan? Hey, Onii-chan? That's weird...I wonder if he's not there. Nono, what do you think? Nono: Mmm...that's not possible. His shoes were at the entrance and he wasn't in any of the other rooms. Nana: You're right. We even saw him come into the house. There's no doubt that he's in his room.