I died; I, a young man with a promising future, died in my sleep. This wouldn't be so bad if I hadn't been reincarnated in another world as a member of the Reinhardt species, the only species that cannot use mana, the fundamental energy to create magic. 

I became a slave and was sold as a blood bag to a high-nobility vampire family. My lady is a rude girl, and very rebellious, but is still a member of the high nobility. 

My life would always be full of problems if it weren't for one detail: of a species inept at magical arts, I am the only individual who can use magic. And as if that weren't enough, I I have a monstrous talent for this.

Now, I have to start attending the academy with my master, because now I am no longer a mere slave, but a "product worth investing in". 

I kind of like it, but aliens have invaded my current world, dungeons are being opened everywhere, gods are fighting for control of the world's faith and I, a mere slave, I got involved in all this. 

Why?! Why can't I live peacefully?!