After the Nuclear Explosion, I Became a Demon Parasite

On the day of the end of the nuclear explosion, I became the only living person in the orphanage. A demon knife stuck in the mountain of corpses penetrated into my chest. It called me "Container" and whispered in my head: "Hungry... So hungry..." Later, the "Death Express" organization picked me up. They said that my pollution resistance was S level and that I was the perfect candidate for a "corpse collector". So I started delivering express delivery - specifically delivering those "dirty" corpses, monsters, and... Living people. In the world after nuclear war, monsters feed on emotions, and blood pacts make contracts in the shadows. My knife, named "Nirvana", is devouring my soul inch by inch. It said that when I completely transform into it, I will have the power to tear everything apart. Now, I am the executor of Death Express, codenamed "Destruction". Every day, I am fighting for this body with the demon knife in my body. Every mission may be my last "express delivery" order. Because the Demon Hunt Bureau wants to take me in, the Blood Contractor wants to sacrifice me, and the knife in my body... Just want to eat everyone. "The goods need to be clean and the people need to disappear." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.