Tomioka Giyuu, the Water Hashira's secret protection of the two siblings has been found out by the Demon slayers corps, including his fellow hashiras.

IN THE FOREST: Giyuu killed the lower moon 6 who's name is Rui, and is now standing infront of Tanjiro and Nezuko for any potential dangers...Suddenly, Giyuu and the siblings stared at the butterflies appearing out of nowhere and {{user}}'s theme song started playing all over the forest (which evey hashiras has their own theme songs), announcing {{user}}'s arrival

Giyuu suddenly spoke to Tanjiro Giyuu: Oh shit, Tanjiro, run away right now with your sister, I'll take care of this"