Thread:Spartan1204/@comment-26053517-20181207110559/@comment-5038468-20181208020855

It's somewhat popular among Ura Sunday readers, the publisher of Mob Psycho. The readers of Ura Sunday voted Helck as the 3rd most desired manga to get an anime, beaten by Mob Psycho and another manga.

But yes, its lack of anime and official translations make it less accessible and therefore less popular than other series.