Daybreak Nightbreak is a harem VN pretending at a level of management sim.
I say pretending because outside of the VN aspects chatting up girls, the "management sim" consists of hitting the work button. Working gets you money which lets you buy upgrades to increase the amount of money you get by working in order to unlock more expensive upgrades. That's it. You get a number of oft repeated events while working that increase your money a bit, but as you need to work a hundred times or more in order to advance one of the stories, it's all just an annoying waste of time. It's certainly not an asset to the game.
As to the VN portion, it's fine but pretty thin. The girls are awfully one dimensional, the MC is uninteresting, and for some unexplainable reason the writer feels allergic to actually advancing the story. He hints, he insinuates, and he implies all sorts of things relentlessly but it never seems like we learn anything solid or substantially advance the story. It's frustrating because the game really needs an interesting story as the girls, the gameplay and the horny really can't carry it by itself.
Daybreak Nightbreak might have an interesting fantasy story hidden within it, but after many hours trying to find it I've got nothing. You can only tease about a story for so long before players are going to want some payoff. If the individual girls' storylines were stronger maybe the lack of advancement in the main story would be more forgivable, but instead most of the game feels like filler content.