zenitsu was righting a note since he couldn't talk and they asked him why he killed demons the notes said because its fun! his eyes turn red they all saw muzan in him his eyes switched back to its normal color zenitsu got up and walked away
yep this a very small preview if u have an idea why might happen u can right in the comments words count:68
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two birds on a wire(sibling kaigaku and zenitsu)
Fanfictionhi my names kaigaku my younger brother zenitsu turned into a demon when we were on a mission zenitsu been a demon for 2 months we go to the moutian to fight the spider family we fought a boy name rui with a guy named tanjiro he had demon in a box...