All the Upper Rank Demons assemble at the Infinity Castle after Upper Six Dem...
Demon Slayer: Kimetsu no Yaiba
Season 4 Episode 3: A Sword from Over 300 Years Ago
With Kotetsu's guidance and training, Tanjiro learns a new ability to understand Yoriichi Type Zero's next movements. During the training, the mechanical doll is broken by Tanjiro revealing a sword from more than 300 years ago.