The Butterfly Effect || Giyuu x Shinobu || KNY AU

Ever since he was a kid, Giyuu Tomioka, the Water Hashira, has experienced weird blackouts where he would flash from the beginning of an event and after the event, forgetting whatever happened. He kept multiple journals, explaining the before and after events to keep track, whilst a kid.

One day, after the war with Muzan, he finds his old journals and discovers something he could do in order to fix his mistakes..

Warnings
Swearing
Blood Mentions
Possible timeline confusion