Demon Slayer: I Will Inherit Yuan's Brother and Become the Lord

[Double time travel with brothers + system + no tragedy daddy + make up for regrets] My brothers and I cosplayed with Enichi and Uyashiki Yōya and were both transported through the world of Demon Slayer: Kimetsu no Yaiba. I became the strongest ghost hunter who was born to see through the world and master the breath of the sun - Enichi Sikuni, with the power to kill all evil ghosts, and was born to stand at the pinnacle of human combat power; and the brother who accompanied me became the leader of the Demon Slayer Squad, with the blood of the Ubuyashiki clan, leading the team with his life as the guide, and fighting against the most evil ghost in the world, Tsuji Mukai. The brothers who used to be side by side, now one is the ceiling of combat power, and the other is the backbone of the Demon Slayer Corps. We are no longer ordinary mortals, but twin cores destined to rewrite the history of ghost hunting. I used the Sun Blade to slay the evil spirits and clear the darkness ahead; he used his wisdom and majesty to unite the whole team and hold up the last hope of mankind. The fear of no misfortune, the obsession of black death, the fate of blood and tears of hunting ghosts for hundreds of years... In this life, if there are brothers who are united, who have the strongest power and the wisdom of the commander-in-chief, they will definitely end the era of ghosts and protect the world from everlasting night.