Seraph of the End: the Journey of the Cursed Warrior

It's the Warhammer 40k Astartes traveling to the Seraph world of the end. Because all the Space Marines who appear are dead or suspected dead, they are called "Curse Warriors". (Front row reminder, this book is terrible, please be prepared) At some unknown time, the entire world was suddenly attacked by an unknown virus and almost completely destroyed. But only children under the age of 13 were not infected by the virus and survived. However, these children are ruled by vampires who emerge from the underground and are raised as livestock to provide blood.