Nanaki Nanao‘s Helck fantasy manga is getting an anime adaptation. The news was announced by Shogakukan editor Shou Kobayashi on Twitter with an illustration.
Helck ran from 2014 to 2017 with 12 tankoubon volumes. It was serialized in Ura Sunday magazine and the MangaONE app and published under the Ura Shonen Sunday Comics label. The story takes place after the defeat of the Demon King at the hands of a hero. With the Demon King’s throne vacant, a battle kicks off to determine his successor. Unexpectedly, one of the participants is a mighty human called Helck, who claims to hate other humans.

The manga received a spin-off centered on the character Piwi in 2018.
Source: @sho_MangaOne