In early 20th-century Japan, a small charcoal merchant named Tanjiro lived an uneventful life in the mountains. Until the tragic day when, after a short absence, he returns to find his village and family massacred by an ogre! The only survivor of this tragedy is his younger sister, Nezuko. Alas, upon contact with the beast, she too has transformed into a monster... In order to reverse the process and avenge his family, Tanjiro decides to embark on a quest for the truth. For the young hero and his sister, a long adventure of blood and steel begins!