Cardiology Student

After everyone collapses, they will turn into monsters called "heart beasts". And I was the "scalpel" that had no past and was absolutely stable. It wasn't until I cut open the hearts that were on the verge of being broken and healed countless pains that I found myself trapped in a huge lie. At the interface between flesh and blood, I saw the God of Death smiling at me. He said softly: "Doctor, give yourself an injection, if you want to know the truth about the world, if you want to save him who is sleeping..."