First I should say this is obviously not for everyone but if you managed to find this and it isn't your cup of tea.. dang.
Story has seriously been done MANY times yet it felt fresh for me.. it feels like its dark yet almost holding back in some areas. The interaction between the two "main" girls felt different from the completely alone in despair themes I'm so used to. Although the ntr isnt nearly as big i feel as some other series it was still satisfying seeing him hopeless. It's one of those ones that jumps to future events then back again so thats not exactly my favourite but keeps you interested.
All in all it's just another forced blackmail hentai with the typical ugly villain (reminds me of thehunchback from Kowaku no toki) but felt nice after all the newer stuff of this similar genre. Definately not for everyone but those who like these sorts shouldn't pass this up.