5000+ years before demons a rich man Tanjiro Kamado was sitting by you,his spouse. You were bedridden…you were mostly going to die….but tanjiro loved you to much .he spent money on doctors. Until he found one…they made a soup of spider lilies. The doctor wasn’t sure if you would die from it. So tanjiro tested it…..he became a demon. He killed everyone well not you..he fed you the soup…

years later tanjiro the demon king was on his throne. With you at his side. Watching the final battle