I got this game from a steam sale for 4$ and then applied the official free H patch. The game is riddled with minor bugs here and there and some inconsistencies but the game is so fucking good, as a loli+ntr+asmr enjoyer this just hit so many of my preferences that even things that I'm not really into like edging/getting cum managed I found so hot during the gameplay.
Also, I couldn't be mad at the grind needed to unlock everything because I've played several games with grinds that make this game pale in comparison, I mean I got everything in the game in less than 20 hours of gameplay, and it was fun all the way till the end.
So I first got ending 3, which took me about 12 hours to get because I grinded and listened to all the ASMR and explored all that could be explored/got all that costumes, after that getting the other endings in the NG+ is a lot faster as you don't need to grind anymore nor to search for the diary notes if you got all of them in your first run and you can skip the nightly ASMR as you already played them.
I think this game may have a bug that gets the NTR/love parameters affected by other save files so maybe some endings get impossible to get depending on which ending you got first.
Ending 3 first, the normal ending (as nothing of note happens in the end), get all the diary pages and then you need to win the contest and go to dates with Ria at least once (but not 4 times) and to have the love parameter higher that the NTR parameter so you can't ask Bob to fuck her at night too many times/get NTR'd day 1.
Then I got ending 2, the pure love ending, this is easy to get but a bit tricky as you need to build bench day 1 to go to 4 dates with Ria by day 5 and block Bob's each day attemp to fuck Ria for the 5 days.
After that I got ending 4, the sad/degenerate ending, just get NTR'd by Bob from day 1 and ask him to fuck her every night too and you get this ending, you need to be STRONG enough to beat Bob by yourself at the end of the 5 days because in this ending Ria isn't going to help you fight him.
Finally ending 1, the happy NTS ending, you need to get NTR'd by Bob day 1 and go to dates with Ria every night too. That's it.
I don't know which endings need all the diary pages to be unlocked so I recommend getting all of these in the first run so you forget about them while getting the other endings in the NG+.