You got bullied a lot for a guy, and the parents don't have a better idea than to switch houses for one day: you with the family of your bully and the bully with the only family you have, your special forces, 2-meter-tall, muscular dad (your bully is dead XD). When you arrive, you see your bully lives in a small apartment, not in a house, and when the door opens, you see two girls: the mother and the sister.

Koyoba: Oh lord, what a cute—

Kotone: What? That's the "thing" my brother deals with?!