Greetings fellow ntrbros.
Now that I already finished the whole game (albeit there's seemed to be two scenes yet unlocked), let me give a short review for this game.
First thing first, as Evil and sorrow have stated, this game is pretty much a direct almost-rip-off of NTRPG 2, with how the MC got slammed underground after finding and placing four ancient orbs and the rival delves underground, bring riches to the town, and corrupting girls here and there, except there's a difference here.
Unlike NTRPG 2's cucker (admit it, NTRer is too mouthful), who happened to be the Ragnas, most majestic, strongest Dragon Slayer from the capital, the cucker here, is Garuro (or is it Garlo? Let's go with Garlo), the MC's and heroine's childhood friend/local bully and punk who just came home from adventuring. Yep, so despite the NTRPG 2 setting, the cucker instead is taken from NTRPG 1's Libido. Heck, even some of the scenes are taken from the first game (I'm looking at you midnight bar bachelor party scene).
Another difference is, unlike the NTRPG which female character other than Tiris (NTRPG 1) and Philia (NTRPG 2) only act as one-scene-wonder cocksleeve, this game gave us Suipi (I really don't know how to read it, is it Suipi? or Sweet Pea? Let's go with the former) and Momiji as a side heroine, which is pretty much Lilia and Kaede rip-off from NTRPG2 (except Suipi is using a female mage sprite here). Different from their NTRPG counterpart, Suipi and Momiji were shown to be quite attracted to MC before the cucker arrived, but once he appeared and fucked the two girls, things went south alright.
Also, you get at least three stages with the side heroines in terms of their evaluation regarding the two man (MC and cucker). For example, when Garlo first came, Suipi pretty much went 'That Garlo is such a troublemaker. You shouldn't bother yourself with that kind of man', but after she got raped by Garlo, she goes 'Now that I think about it, Garlo isn't really that bad of a guy. Actually, he's quite nice if you get to know him'. Eventually, when she was corrupted to the point she's asking Tiria for a threesome with Garlo, she said something along the line of 'A man's value comes from their strength in various things, not just their skills at fighting', referring to how she tend to MC during his sword training with the dummy at the start.
Overall, this game is a lot shorter than the NTRPGs, but I guess it's excatly because of that that I ended up invested in the side heroine more than Tiria as the main heroine. But if there's one thing that I prefer from this game compared to NTRPG 2, it's the cucker.
Yeah, it might be an unpopular opinion, and I might already stated it somewhere, but when the cucker is an untouchable alpha of godly gift and strength like Ragnas, it makes the NTR feels kinda lacking. I mean, what the fuck Mars can do about it? Getting bitchslapped by the very Dragon Slayer in command of a batallion of elite knight? On the other hand, when the cucker is your everyday bully/local punk like Libido (from NTRPG 1) and Garlo (from this game), well, at least I can enjoy the fact that it's the MC's fault for doing shit and being clueless in general. What makes NTR great is knowing that the cucked actually can do something about it, but didn't, and ended up getting fucked up in the end.
Tl;dr: for ntrbros want some nostalgia play or have some time to spent, this game is quite great. 7/10