Continuation of the demonic adventures of the hero Tanjiro Kamado and his strange company. In the center of the story is an alternative reality in which there are demons that devour people. Besides, monsters are afraid of the sun. Only special squads can cope with ghouls. In them, fighters undergo hellish many hours of training. Otherwise, the demonic army cannot be defeated. In the second season, the Kamado family died at the hands of evil spirits. When the young man returned home, a terrifying picture appeared before his eyes. After the tragedy, he and his sister Nezuko survived.
But the girl survived only because she herself reincarnated as a demon and nearly killed her brother. However, family ties turned out to be stronger than dark forces. Now, along with Tanjiro Nezuka, they are warriors of an organization to fight demons called Urokodaki. Kamado does not lose hope to save his sister from the demonic essence of the Oni and find the killer of his parents. The guys and their friends from previous seasons will have to fight evil spirits again. A signal was received from the Red Light District: local residents began to disappear into nowhere. Experienced fighters suspect that the disappearances are the work of demons. Will the brave warriors be able to defeat the bloodthirsty ghouls?