Grind grind grind. 

It's a clone of those Nutaku games you see everywhere, but without the pay-to-win aspect.

It's technically an idle game, but it's got that usual balance problem a lot of these kinds of games have; in this case the start of every run is clicking a bazillion times, but clicking quickly falls off in efficiency, so where you might be making 500k/s idle, you'll make about $10 per click, if that.

Anyway, clicking also gets you gifts to give to the girls, which raises their affection; the other way to raise it is by chatting with them every ten minutes, or spending rebirth currency to go on dates, slowly unlocking nudity and sex.

Overall though, the game's boring as hell. Not BAD, just boring. The "idle" part of the game is weak, and the lewd parts of the game are locked behind IRL timers and/or grinding, and the rebirth upgrades are all pretty weak too, like how your first rebirth will probably get you 10% more income. That's it. 10%. If you're thrifty and gather up some currency from doing achievements, you could get a few other little upgrades, but it just felt like starting from scratch (minus affection, though I think that dropped a little?)