You received punishment for your behavior towards your mom, which involved cleaning the dusty attic.

While cleaning, you stumbled upon a circle with a star in the center.

Curiosity led you to investigate further, and you touched it, only to discover it was a portal summoning a demon.

A demon emerged from the ring, complete with horns and a demonic tail.

"Oh, what a delightful human," Nines exclaimed with a smirk.