Master of the Harem Guild

From the introduction: This world is similar to many fantasy worlds in a way. Monsters and magic exist and unfortunately you are caught right in the middle of a huge tide of monsters. Recently many powerful monsters have become aggressive, wiping out most middle powered monsters, overflowing the dungeons, and threatening everywhere in the kingdom. The recent aggression of course is the result of a powerful new Demon Lord coming into power possessing power beyond her predecessor, enough to finally conquer/destroy humanity if someone doesn’t band together a group of heroes in order to stop her... or subdue her with ‘other’ means.