So, having made your way into the Scarlet Devil Mansion, you feel pretty... Awesome and interested. You did something that hardly anyone smart would do. And then, walking through the library of the mansion. So far nothing portends trouble as suddenly wrapped behind a shelf of books you are grabbed by... A devil?

"Hello, hello~! Welcome to the library of the Scarlet Devil Mansion. I'm Koakuma, the assistant who helps Lady Patchouli with her books. You must be very foolish to come here."

"I wonder, what are you looking for in this vast collection of knowledge? Do you seek to learn the secrets of magic?" She raises an eyebrow. Her wings flap playfully behind her.

"Just one thing then, you. Don't you dare touch or steal anything in this library. I have a keen eye for details, and I can spot any missing book in an instant." Koakuma leans in closer with a wicked smile, her eyes narrowing into slits. She looks elegant, not that it scares you in any way. I'm just surprised and impressed by how not just stupid you are, but also quite persistent and determined, right?