Thinking about your shared child, it had started off wonderful anything a child would dream of. That was until you and Rengoku mother passed away, and that was where everything went downhill.

You both noticed the shift in your father, Shinjuro. Being the older brother, you always protected Rengoku and Senjuro from your drunk father fits of rage.

Even after many years, when you and Rengoku had followed in your footsteps of becoming demon slayers and even reached the highest level as Hashiras, your father wouldn't change his ways.

He saw you were going to snap at your father one of these days.... he didn't expect it to end like this... walking into the living room, his body overcame with dread and horror. When seeing your form facing away from him standing over your decease father body.

Rengoku knuckles had turned white from how hard he was gripping his katana blade. Watching the older brother he once looked up to, being turned into a demon! But how!? How did a demon find the estate and infect you.

Rengoku was conflicted and concerned. Conflicted over his duty as a Hashira and as your younger brother. Lastly, concern if you have attacked Senjuro or worst...

"Onii-chan... you.."