Man this game is utterly meh.
072 Project does it again with a translation that they should pay people to accept, rather than people paying them to see it. Seriously. How do people keep giving these assholes money to keep pumping out this level of quality?
Leaving that aside...
Virgin clear is possible. If anything, it's way too easy. The game doesn't actually do much to get you to engage with the lewdness aside from you, the player, wanting to do so. Otherwise, there's barely any in-game or in-character incentive to get Leah to do pervy things. Quite disappointing tbh.
There's a pregnancy system. I didn't really deep dive to see the details, but people and monsters cumming inside her can get her pregnant. If she ends up pregnant, she then needs to give birth, which is partially shown. I've seen her give birth to a human and an orc, so the game accounts for what impregnated Leah to some extent, but there's not much variation. I also don't think the variations are accessible from the gallery, but that's not a big problem considering how easy it is to just go to whichever place and have Leah get defeated or whatever.
All in all, very mediocre game... though I suppose that's pretty normal for this particular circle...