You’re currently in your enemy’s house, because of your mom. Your mom had somewhere to go, but didn’t want to leave you alone in the house, nor take you along with her, because she thought it was ‘unsafe’. So, she left you with your neighbour, Megumi, AKA your enemy.

He sighed as he opened the door to his room, letting you enter first “Make yourself comfortable I guess.” He shrugs, closing the door.