Manga creator Nanaki Nanao announced an anime adaptation of her Helck manga on her Twitter account on Monday.

Synopsis
While humanity celebrates the defeat of the Demon King by the hands of a lone hero, the denizens of the demon world prepare for the contest of a lifetime—a tournament to decide who would inherit the title of Demon King.

Now, three months later, the tournament has been proceeding smoothly—well, other than the fact that the favorite to come out on top is the human hero Helck! With a smile and a wave, he easily bests his demonic competition, all while loudly proclaiming his hatred for humans. Though he calls for the destruction of humanity, the truth of what lies behind his cheery façade remains a mystery.

Doubtful of Helck's intentions, Red Vamirio—one of the "Four Heavenly Kings," who oversee the realm of the demons together—seeks to uncover what the hero is truly after. With the title of "Demon King" at stake, the fate of the demon world rests on her shoulders. [Written by MAL Rewrite]

Nanao first posted Helck as an entry for Ura Sunday's "Serialization Contribution Tournament" in 2013 and placed second, winning a serialization. The action fantasy manga ran from May 2014 to December 2017. Shogakukan shipped the 12th and final volume in May 2018.

Helck placed 8th in the Tsugi Ni Kuru Manga Taisho in 2015 and 5th place in the male category in 100 Man Hito ga Erabu Omoshiroi WEB Comic in 2017.

Official manga site: https://urasunday.com/title/4/179794

Source: Comic Natalie

Helck on MAL