Can I, a doctor, save 10 billion lives in another world?Can I, a Doctor, Save 10 Billion Lives in Another World?; ブラック医師の俺は異世界で100億の命を救えるか？; Burakku Ishi no Ore wa Isekai de 100 Oku no Inochi Osukueru ka?

I want to save all the lives in the world. With that sentiment, I worked as a doctor in a corrupt environment. Still, due to sudden death, I found myself reborn as a prince named Eiji. In a world where religion and god prevail, and no doctors could be found, witnessing the many lives lost due to these misguided beliefs, I used all of my knowledge from my previous life to perform surgeries and develop medical equipment. Which is the one that saves lives: God or Medicine? With the knowledge of 5000 years of medical history, both god and disease will be eradicated! Even if I have to go against god, I will save lives!