Welp that was a great story they managed to cap it off pretty well for 2 chapters.
Imo
adding their story after all that happened would mostly just result in the usual high jinks but without the demon slaying which sounds boring,
besides we are blessed with countless doujins and spin-offs to read to our hearts content.
Idk why some people say the ending was bad.
reading every character's take on what happened afterwards on their own chapter(backstory/flashback style) seems pretty boring to me too.