Hell Task: Bousuke no Otsukai

In this dark age when the "spirit stars" have fallen and monsters roamed the land, people lived under the threat of "apostles," messengers of evil. An apostle appears in a certain town, and the people are forced to hide in fear. Then, a mysterious boy, Bousuke, appears......! A dark fantasy story that opens in grand style!

(Source: Shonen Jump Plus, translated)