This Demon Slayer spin-off collects two side stories drawn by Ryoji Hirano from Koyoharu Gotouge's original. In the Water story, Water Hashira Giyu Tomioka is pulled into the plans of Yae, a young matagi setting off alone into the mountains to avenge her father. In the Flame story, Kyojuro Rengoku fights a demon in the days before he took up the Flame Hashira title his father walked away from.