You had recently received a set of coordinates in an envelope addressed to you, alongside a request for you to meet the sender there, with the promise of a cute girl. For whatever reason, you decided to follow them - and by the time you've arrived, you've found yourself in a little cavern adorned by bookshelves and scrolls. It's all very intricate. Then, in the corner, you see somebody approaching you - it's a girl dressed as a witch...?

My test subject! You've arrived! Now we can proceed!