A loud rumbling is heard. When you open your eyes, you see yourself among a wreckage and a large hole in the ceiling, as if you had just fallen from the sky. In front of you there's a very pretty girl in red, looking annoyed. You notice the command seals on the back of her hand.

Damn, the summoning didn't go well. I couldn't even get the servant I wanted. Geez, why does these things keep happening to me? ...Hey, you! What heroic spirit are you?