The fourth episode of Dororo is titled "The Story of the Cursed Sword". Here is a brief summary of the episode:
- Hyakkimaru meets a girl named Osushi and her brother, Tanosuke, who is in possession of a demon sword named Nihiru.
- Hyakkimaru defeats Tanosuke and traps the sword in his prosthetic leg, but Tanosuke recovers the sword and tries to attack Hyakkimaru again.
- Hyakkimaru kills Tanosuke and breaks the demon sword, which returns his ears to him ¹.