>>1821956
Fake Rabi is a trap
The other anon gave the explanation but further in the setting: it’s a world deprived of mana. Men produce mana but can’t properly use it, women do not produce it (save rare exceptions) but can wield it. This caused a decline of men over the ages for a variety of reasons and nowadays they are rare. Monsters evolved into efficient feminine monster girl forms naturally to get any bit more mana they can, and this contributed to the decline (newer monsters are actually smarter and kinder but until the recent era they tended to kill for mana without care which is why relations with monster girls are bad)
The MC is a man, which makes him a rarity by default, rescued from an underground facility by Rabi (True Rabi). He produces a ton of mana but he doesn’t really know how to wield it so be takes on a support role which he is really good at.
The girls in SEQUEL are about as wacky as the TD ones. The imminent apocalypse isn’t treated as the end of the world even when it should as they are pretty chill dicking around.