Marbas and Wisteria have forged a pact to be together, but the world doesn't take too kindly to dealing with demons, and now a familiar knight from the Sword Cross order is tracking them down.
It's no different than 
picking up a new hobby.
هذا لا يختلف عن تعلّم هواية جديدة
Das ist für mich nichts
als nur ein neues Hobby.
Non è così diverso dallo scegliersi un hobby.
Não é nada diferente de
arrumar um hobby novo.