From the introduction:
It's an unfortunate fact that your ability in your chosen field has very little to do with whether you are hired; instead, it’s your social grace and skill at interviewing that lands you a job. The otherwise excellent white mage Franz finds this out to his detriment when not a single one of the 35 white magic businesses he applied to were willing to hire him due to him freezing up in his interviews. In a desperate bid for employment, he reached out to Necrogrant Black Magic Inc., only for all his prejudices about black magic—infamous for being a disgusting, dirty, and dangerous practice—to be dashed in a single meeting with company president Cercer.
Blood spilling?
Nope.
Sacrificing your lifespan?
No need!
Live sacrifices?
Goats are expensive, so no!