Lv1 Maou no Ponkotsu Hishokan

Zenia, the Demon Lord's secretary, came along with the Demon Lord to the human world. However, her life in the human world is a bit of a mess...? This is an official spin-off gag manga featuring Zenia from Level 1 Demon Lord and One Room Hero!

(Source: Comic Fuz, translated)

Note: Chapter count includes 3 extra chapters.