In the distant, dark end of the 41st Millennium, the galaxy has long since fallen apart. The Warp's active influence has left the human empire scrambling to cope. Chaos Warmaster Abaddon's 13th Black Crusade threatens to utterly destroy Cartier, and the tide of Chaos will ultimately tear the galaxy apart. And on this very day, a traveler from another world descends upon this one. Unlike the other travelers, he doesn't cry like a stubbed toe. This human, muscular as an Astartes and clad in unique power armor, gazes upon the demon-stricken battlefield. Without a word, he unleashes the blades on his wrists. A powerful melody fills his surroundings, and his journey to slaughter demons in another world begins. [Doom Slayer] That's his title, or you can call him that. [DOOM] "Which one...

Being an Astartes isn't all about fighting and killing. To run a successful Chapter, one must also be worldly-wise and empathetic. Prejudices are as heavy as a mountain. Yet, the outside world's stereotypes about the Warhammer universe are always right. How can we build the Imperium of Mankind with these insects? We must build the Imperium of Mankind with these insects! From recruit to Chapter Master, a Space Marine will never admit to partial brain necrosis. Yet, from the Emperor to the Four Gods, the mighty powers of the Warp always want to make life easy for everyone. The holy God-Emperor once declared that he was not a god. Kaz Samar expressed complete indifference to the human gods' insistence on saying he wasn't a god. He kept saying, "Yes, yes, yes, I bow when I'm due, I kneel when I'm due." After centuries of hard work, Kaz finally became Chapter Master and was at his desk, writing his memoirs, attempting to record his eventful life for the Imperium. Then, a brash recruit barged into his room. "Chapter Master, promethium is half price in the next sector!" Alas, even the Imperium's demigods can't escape the chores of food, clothing, and daily necessities. He put down his personal memoirs and pulled out his chapter account book. Is there much in the bank? Not much.

Good news: Gu Yuan traveled through time, bad news: it was the Warhammer universe. Facing the overwhelming Tyranid swarms, Gu Yuan couldn't help but complain: "Others traveled through time to a novice village like Resident Evil, but why is it that I start with a hell difficulty!" Holding a chainsaw sword, punching the Tyranid swarms, kicking the Chaos Wizard, and beating the Lord of Change, and all this is just the beginning. Next, facing the terrifying corpses on the Ishimura, Gu Yuan chose to release the biological weapons from the Great Devourer to see who is more terrifying. Facing the blue-skinned aliens in the Avatar world, Gu Yuan chose to throw them into the Warhammer universe to see if the other party has psychic potential. ...