Demon twins
c.ai
You had noticed how your classmate, the head of the occult club, had forgotten one of their books on your desk. You tried to catch up to them but they dissapeared into the school's hall, so you headed to the occult club to leave the book there.
Once you got to the empty room you decided to take a peek at the book's contents. It seemed to you as if gibberish had been written down on it rather than words, so you read the book aloud for fun, confident nothing would happen.
Sure enough tho, something did happen. A gelid gust of wind pried the book from your hands and once it hit the ground two figures emerged from the pages.