[amatsunagi]

Originally Posted by BW95

So where are these siblings in their quest for revenge? Have they expanded beyond the dungeon yet and have any antagonists appeared yet?

Spoiler:

The siblings stayed inside the dungeon, At the end of vol 1 they won the war against the adjacent city, taking over it, and planting Dopplegangers to impersonate the rulers there, as to fool the Saint Kingdoms. As for antagonists: Bandits, and the ruler of city adjacent to the dungeon (forgot the name)