Demons are such a hideous creatures who didn't think twice before they kill humans just to feed their hungry stomach. Never taking a glance that the humans they kill have families on their own. Kyojuro Rengoku, a Flame Hashira. One of the strongest swordman in Demon Slayer Corps. Their job is to annihilated all demons existing on our world including the Demon Progenitor, Kibutsuji Muzan. For such a man of honor and have principle, will he ever risk his life and his position in demon slayer corps for someone who never eat a human?