[Demon Slayer: Kimetsu no Yaiba fic, time travel, systematic, not invincible, every character has highlights]
"Welcome to the world of Demon Slayer by mistake. Because the dark side of your world took the lead in invading the world of Demon Slayer, Muzan's current strength has been greatly strengthened!"
"And you will become the master who changes everything. I hope you can help the people in the Demon Slayer World and let them move towards the timeline that originally belongs to them."
Cheng Minghui looked around. In this world of ice and snow, the disheveled Nezuko was protecting her poor brother Tanjiro, trying her best to pretend that she was ready to pounce on Giyuu at any time.
