As seems to be the usual for this circle... what we have here is a very meh game. While the quality of the art is pretty good... that's pretty much the only good thing I can say about this game.
The story is non-existent. The scenes are few and they try to inflate the number in the gallery with the virgin/non-virgin variations, even if the CGs are exactly the same and the text is 90% the same. The way to unlock said scenes in the gallery is messy and buggy.
Most importantly, the gameplay is bad. What I mean by that is that you have no hints pretty much all the time in terms of when you might lead the girl into an H-event. There's literally one event on the 1st floor where you just have her enter a room and runs straight into unavoidable rape in the darkness. This is bad game design, especially for a puzzle and exploration game, because there's no skill or thinking involved in avoiding the rape events, it's just a matter of luck and save scumming.
Obviously, since this is an H-game, you DO want to get them all anyway, but if the option exists to avoid them for the sake of immersion and for the sake of better rape fantasies, then there should be more to it than just "lol, you go unlucky, rape time".
Still not the worst way to waste some time, but I honestly recommend using the guide and/or grabbing the save files in the thread to unlock everything. You're honestly not missing out on much by not playing this and just checking the scenes in the gallery. The context is barely there and doesn't really change all that much...