Webmuzan kibutsuji, the series' primary antagonist, killed tanjiro kamado's entire family and turned his sister nezuko into a demon. As the first demon in the world,. Webdespite his fearsome reputation among slayers and demons alike, muzan had an illness that almost took his life in demon slayer, resulting in his intense fear of. Webas hantengu died, muzan was able to see and hear what hantengu himself could see and hear, and hantengu seemingly caught a glimpse of nezuko just before he completely. Webthe revelation of muzan’s origin unfolds in the season finale of the “demon slayer swordsmith village arc. ”. Webin demon slayer, muzan desperately seeks the blue spider lily for centuries. Here’s why muzan requires it to achieve his goal. Webmuzan created demons by sharing his blood and seeks blue spider lily to cure his sunlight aversion weakness. Muzan's complex backstory and motivations. Webone thing that bothered me while reading the manga was muzan's motive behind killing the kamado family and turning nezuko into a demon: We saw how calculated and. Webwhen yoriichi fights muzan for the first time, he uses his vision to see muzan's inner structure and discovers that muzan has seven hearts and five brains.