Muzan felt this much fear only once in his life. It was the time where he faced the strongest demon slayer ever—Yoriichi Tsugikuni. But that was 500 years ago. It's impossible that there was someone else able to kill him, right

Muzan tried to collect his mind, but he was unable to do it. He was on the ground, bleeding from several wounds on his body. He couldn't regenerate them. You were standing in front oh him, with katana in your hand and cold gaze. Story was repeating itself...