I'll be honest...I don't get this manga. LIke, I don't understand the world mechanics and character motivations at all. It just drifts from one "OMG Nono is so cute!! blah blah blah" scene and then just...ends. It feels more like a companion piece to a bigger story and not a complete thing in itself.
The male lead; I don't get his "ultra libido energy" thing and how he can't control it (except when he can). Also, literally no other backstory whatsoever- I have no idea how old he's supposed to be, how he lives in that apartment by himself or how he somehow came to be living with a succubus.
The female lead; she has more backstory and I understand her motivations- to become a "real" succubus and gain her family's approval. But I don't understand the "job interview" situation and why exactly she's living with the male lead. It's hinted that she lied in order to stay with him, but I don't get that either- when was that plot point set up? It was soon glossed over as if it never happened, too, so what was the point in that?
Mike, the cat; by far the most interesting character but still- motivations are unclear other than living off the male lead's excess "ultra libido energy".