What if there's no demon, everyone will be happy? Let's see Tanjiro didn't lost his family and Nezuko wouldn't be demon. Giyu didn't lost his sister and Sabito. Shinobu didn't lost her sister. Sanemi and Genya lost there family and their familyship will be closer. Kyomai didn't lost his childs and not called murder. Muichiro didn't lost his family and Yuichiro. Tengen didn't lost his left arm and left eye. But really everyone be happy? Zenitsu will keep frauded by girls. Inosuke will domestic violenced at his home. Iguro will keep been discriminationed. Mitsuri have to keep hide her strength. Kyojuro can't fired his heart. Kanao has to keep selling. Yushiro will die because week body. Daki can't live again. Really there's no deamon. Everyone will be happy?