【An act of kindness?】 Demon Slayer Fanfiction

What if Nezuko Kamado was the only survivor? What if Tanjiro too, died in that incident with his family? ..and, what if she encountered a demon slayer? And what if that demon slayer happens to be a pillar that is willing to kill any demon they see without second thoughts? And if that very pillar spared Nezuko's life...