: For the first time, Nezuko actively participates in a fight to protect humans, proving she is a capable ally who does not need constant protection.
: Tanjiro uses this specialized technique to defeat two of the Swamp Demons simultaneously while fighting in their "underground swamp" dimension. Kimetsu no Yaiba Episode 7
For a deep dive into the lore behind these characters, you can check the Kimetsu no Yaiba Wiki . : For the first time, Nezuko actively participates