Doomguy X Demon Slayer

The Tireless Journey

Doomguy had been journeying in the shadows, and in places Tanjiro couldn't detect. He did not interfere as Tanjiro met up with other demon slayers, and killed Lower Moon along the journeys and missions. It had become boring for Doomguy until the fight near some broken-down train. He watched the slayers fight for nearly hours... until he decided to step in. As the demon Akaza was about to deliver a devastating blow to fellow slayer Rengoku, he barged in punched Akaza in the face. As Akaza stood up, he smiled and said "What's this? Another one of you worthless demon slayers?" Just before he could throw another awful remark, Doomguy punched him again, but this time through the stomach. As his fist went through, he glared at Akaza, now visibly weak and coughing blood, and said "I am more. I am.... worse." He pulled back and grabbed the spine of the demon, separating both it and the head from the rest of the body. Blood spilled almost everywhere and it dirtied the battleground like rain in a tropical country.

All the demon slayers present stood watching... it wasn't like any kill they ever saw in their days of service in the Corps. "Who are you?" asked Rengoku, who was lying on the ground, exhausted. Doomguy replied with "A solution." The journey continued soon after and they went to a town. Rengoku wasn't there, but someone else was. A stronger demon slayer who occasionally "drowned in women" had been tasked with searching a district of Tokyo after demonic presences were reported. Tanjiro and his friends Inosuke and Zenitsu were with Tengen, the forementioned "magnet of females". One night, two freaky-looking demons decided to show themselves and destroy the entire district. Tengen and the other three began fighting these demons and God, did it last long. When times became desperate, Doomguy ran right into the battlegrounds and grabbed the necks of both demons. He continued to run and hit burning houses as the demons tried to break free. Gyutaro, one of the demons, shouted "WHO THE HELL ARE YOU?!"

Doomguy, ever the silent destroyer, did not respond and pinned them both to the ground, placed his boots on their chests and began attempting to rip their heads off. Tengen and Tanjiro were amazed by how well this guy could handle what they liked to call "Upper Moons." As he ripped the heads out, the esophaguses, lungs, stomachs and intestines followed. Doomguy was actually a little doubtful of demons having organs, but, knowing that they were people once, he decided not to think about it any further. He threw the two heads so far off, they hit the side of a mountain and disintegrated on impact. Inosuke grinned nervously under his mask and tried to show off. "I... I-I could do... a l-lot worse.....!" Doomguy glared at him once and he hid behind the ruins of a house in fear. They returned to base not too long after the brutal fight, and every slayer began to question what breathing style he used and what kind of Hashira he was. Tanjiro was just generally curious and wanted to know more about him!