Urius leaves Arochi. He intends to serve Mudzan. Mudzan quickly notices the appearance of a new demon, and teleports to the fortress of infinity. Urius remains to serve Mudzan, becoming the zero Moon, because the demonic half is very strong.

At that time, Arochi recovered under a tree. It's already morning. Arochi gets up, gathers his thoughts and goes to the organization of the demon slayers. It turned out that a lot of time had passed while Arima was looking for his sword. Considering that Arima found his sword by the age of 75, 50 years have passed since his passing. Now is the era of Taisho. Arochi remembered all the memories, as did Urius, and knew who to go to. Along the way, the human half found the blade of the sun, it looks like someone left it when he was attacked by demons. Taking it, the blade turned gray. Arochi did not have breath and did not know how to fight with swords, so taking the blade, the guy just walked on.

Arochi has been walking for a whole year. Along the way, he met demons from whom he was running away (he had a cowardly nature). I ran into hunters several times and was able to kill several demons with their help. Arochi discovered the ability of the sword, killing a demon, he received an acolyte, in the form of some kind of spirit. The stronger the demon was in life, the stronger the spirit. The most used were: panther spirit (fast ground spirit), hawk spirit (fast flying spirit), nightmare (this is the strongest pet, it is slow but immortal and represents, when used, the fear of the person who fought Arochi). Arochi controlled all of his spirits except for the nightmare. This spirit acted on its own, attacking everyone who was nearby, even comrades. At the end of the journey, Arochi finally reached the demon slayer base.

He was met by Ubuyashiki, along with all the hashira. After explaining his story, he was sent to Sakonji Urokodaki. Having met the former Hashira of water, Arima stays overnight at his house. The guy asked, "Do you know anything about Hiro?" Arochi himself was interested in Hiro, because Urius is constantly getting stronger, and Hiro, as Arima was told, is the strongest demon slayer of all those who once lived. Only Urokodaki wanted to say something, as a strong earthquake occurred, but not a terrestrial one, shook the space itself, and in the sky, far from the old man's house, a purple column of energy pierced upward, which only Arochi and all those who possessed a transparent world saw.

At this time, we are shown a burning house, somewhere in the snow-capped mountains, near the forest. There are two silhouettes near the entrance to the house. And a boy is looking at them, thirty meters away. The boy has two demon slayer marks on his face. One from the right eye, from the mirror mark of the Yorichi. The second is opposite from the left, from the neck to the mouth and cheek, all of them in the form of fire...