I became a vampire girl's blood bag.

I died. Fortunately or unfortunately, I died; of course, that would obviously be bad if I hadn't possessed the body of a person from another world. The only downside is that I'm now looked down upon for being a slave.

I went to a world set in medieval times where magic rules the world, the Reinhardt species, the only one who can't use magic, is a slave... I was reborn as a member of that species. Can you imagine how unlucky that would be?!

Well, it's not that bad, after all, I became a slave to a vampire noblewoman and serve as a blood bag. My mistress is annoying, rebellious, but she's still a member of the nobility. My life would always be filled with bigger problems, however...

Of a species inept at magic, I am the only one who can use magic.