I want to present a different opinion, I personally think it is overrated riding on the IP it is making a parody of. still it is a very enjoyable NTR game. But I personally lost interest after i finished part 2. their other parodies are more interesting.Oh boy you are in for a damn treat.
Check out Sword Art Online by Fujino . There are two parts. The second part is still in development. But don´t understimate the content. THERE IS SOOOOO much stuff to see. For me it is THE best NTR game out there alongside Scars of Summer.
still it is worth checking out for a koikatsu kind of game.