Aquarium tainted skies

"Its not that simple" Muichiro says frowning watching as a small koi fish swims beneath the surface of the water slipping underneath a lily pad. The sun reflecting off the cool blue surface as it runs over rocks and under roots.

"It is though" He replies moving his finger through the stream as ripples span out from beneath his calloused hands "you just got to find who you are first" Muichiro looks up at Him, Bright azure eyes meet Misty light green ones.

Of all the things that should be simple this is not one of them

Or after Yuichirou dies Muichriou is adopted by Kokushibo and after years of working for Muzan, he's taken hostage by the Hashira and slowly learns what it's like to live again.