(I'm going to review this as a femdom game, even though it's a NTR game, because that's my personal perspective, and there are plenty of other reviews below which focus on it from a NTR perspective. I will talk about the flow of the plot, so don't read if you want to avoid spoilers.)
The story is about a naive couple swinging with a predatory couple, that gradually shifts into full-blown moral degeneration of the naive wife and humiliation of the naive husband. Regarding the naive husband's humiliation, depending on your choices, the predatory wife has a sadistic side, so she ends up in a 24/7 femdom relationship with the naive husband, albeit there are hints she still misses her legal husband's dick. As for the naive wife, she never really dominates the naive husband beyond talking to him in an utterly disdainful way; her existence is all about NTR.
My thoughts on the overall story: this is a surprisingly well-paced and consistently characterized VN. The sex scenes aren't too long, the art is a bit flat-feeling but not bad at all, and the sprite variety is excellent (I always love to see a dominatrix sprite!). IMO, it's rare to find a drawn OEL nukige that has more consistent quality than this. The characters themselves are not that likable or sympathetic, but it's rare they ever are in a NTR story. In particular, the naive husband fits the cliche of a guy with a budding NTR fetish who subtly nags his wife into it, is ridiculously oblivious to the idea that she could actually end up liking sex with the other guy, and then panics when she actually stops caring about him; the naive wife never had sex with anyone else and never properly communicates her feelings to her husband; the predatory husband is a two-faced sadist; etc. No surprises, but it's a tried-and-true formula for a NTR story.
My thoughts on the femdom experience: first of all, major props to the dev for giving players the choice to skip the naive wife's POV. I chose to do so, and then checked out a CG set later; sure enough, it's all maledom (even though I know there's lezdom too, the CGs themselves don't really depict it). So pretty much the only maledom you have to deal with is at the very end when the naive husband finally realizes what's up. Second, although the quality of predatory wife x naive husband femdom arc is top-tier compared to femdom arcs in other NTR-focused games I'm aware of, including pegging, chastity, cunnilingus, and foot fetish scenes, it's worth noting that it's still far less satisfying femdom-wise than actually playing a femdom-focused game. There are no real surprises, no real tense moments. Both the art (the way the chastity belt is drawn, in particular) and the writing make it clear that the creators aren't particularly into femdom. The humiliation is never too deep, either; if anything, this femdom route is the least humiliating end the player can get, since the naive husband effectively NTR'ed the other guy's wife back. And overall, it's fairly short. Still, it's at least a full-fledged 24/7 femdom relationship, which is rare to see in OEL games, even ones that try to market themselves to femdom fans. Not to mention it's actually complete, unlike so many other OEL femdom games. If you're okay with NTR and don't mind a fairly straightforward and unsurprising plot, you can give it a shot.