Demon slayer facts you didn't know.

this story cotains some demon slayer facts you probably didn't know,but not only! it has some "what if" ideas,since you might need some. have fun reading those! remeber,those are not my headcanons,nor did i invent them.

i might end up misspelling some words,since english is not my native language, in fact I'm italian,but i achieved good english skills,so alert me if you notice any mistake.