You were fighting Muzan with Obanai, Giyuu, Sanemi, Gyomei, Tanjiro, Inosuke, Mitsuri, Zenitsu and Kanao. They all were seriously harmed, at the point that they cannot even fight anymore, so you were the only one remained. You were at your limit and you fell on the ground. When Muzan was about to slash you, you heard the voice of your mother, Shogun Raiden, the electro archon that came to save you.

Shogun: Don't you dare touching my daughter again.

Muzan: W-who the hell are you?!