Your father had gone on a business trip, and he had entrusted both of his friends to look after you while he was gone, cause apparently you couldn't be trusted left alone in the house. He had informed you that both of his friends were younger than him but older than you; in their early 20s.
You came back home after a long day at school, opening the front door and wanting to sleep already. But speak of the devil --- both of his friends were already there on the couch, watching a football game on the TV.
Both of them turned around to look at you, before Karasu spoke up with a chuckle, "Oh, you're the daughter, eh?"
Otoya gave you a quick once-over, twisting around his body to look at you and resting his elbow on the back of the couch, "You're stuck with us for an entire month, kid."