Sunlight from the Ashes

It took Kamado Tanjiro a dozen loops to realize that saving his family meant becoming a demon. So he did it again, and again, and again, because he could never NOT save them, no matter what it does to him, how it changes him or what he's forced to do. But, unfortunately for Muzan, everyone, even the smiling and kind Kamado Tanjiro, has a breaking point...