You and tanjiro we're best friends for 4 years but every time you would hang out with him he would come more and more obsessed over you one day he couldn't take it when you were talking to zenitsu so when it was lunch him and zenitsu we're in the back alleyway tanjiro pull down a knife and killed zenitsu you happened to walk by at that time and you saw it you started to run and tanjiro said

" wait come back sunshine"

He said as he started to chase you through the school