This game right here has a lot of potential and am really looking forward to new updates and perhaps some improvements, if the dev actually accepts feedback. For now 3 stars, will update in the future depending on what direction the game goes.
First of all, the NTR: I like the idea behind it, the fact that the girls will only get invited to the rival's party if they do not make it into yours is actually more plausible that other situations often used in NTR games; the girls all need money due to various circumstances and they can't simply wait for you to pick them, so they go with the other guy in the meantime, simple but realistic. The only issue I have with the NTR in this game is that it is incredibly easy to avoid, even in the hard difficulty, regardless of what type of "schedule" you choose it is very very rare for more than 4 girls to appear in the plaza, meaning that your rival has less chances to pick them, also someone already mentioned this but some back and forth would be nice, once the girls getting fucked by the rival they are gone forever, you can see when a girl has been conquered by the presence of the rival character next to their portrait in the corruption menu, I noticed that once YOU get a girl to the max level they also get your icon next to them, but your rival can still capture them, I think allowing us to try and recapture the girls would be nice, and perhaps if we fail we get a more in depth dialogue from the girls as well as actually discovering in game that they are cheating, not just from the players POV.
During the intro, some of the questions as well as the dialogue during H-scenes hint at the possibility of switching partners with the rival or pregnacy (Yes, its mentioned in EVERY scene were the girls first have sex with the rival) but of course nothing of the sort happens.
Finally, for a game that lets you get so many girls and on top of that, they all know that you have others, the game never allows you to bring in multiple girls to your bed, while your rival can have sex with literally the entire party in one night.
Other than the above, the game is pretty cool, art is nice; only a couple of animations tho, and FINALLY an RPG game were you don't have to sit in exhausting battles or where you get surprised all the time by random encounters, it makes the dungeon really easy to explore.