I played the game for the revenge ending (on Kendo route), that's what I enjoy most in NTR games.
Although it may seem somewhat okay revenge ending, Satoshi only gets revenge on his bastard uncle. His uncle is no good other than humping, so having sexual dysfunction again is seriously a big blow for him. Also we learn that he is not doing well after 6 months. So yeah, revenge 50% success.
But Satoshi can't get revenge on Mary. As 6 months later she still only thinks about his bastard uncle. Like asking to him how she can contact to his uncle again (like asking his address and phone number, how he is doing). She really is one hypocrite bitch, acting like love is everything to her. Like she ditched Satoshi to his uncle literally in one or two weeks, but she still looks after his uncle even after 6 months later. Although she doesn't want to admit, all she cares about big dick and all she wants to have sex in a day at least 10 hours. That is what she literally is.
So, asking about his uncle is probably most humiliating thing she can do to Satoshi, and she exactly does that. So I'll call that Satoshi's revenge on Mary is complete fail. Heck, she still humiliates Satoshi even after 6 months. That bitch is really something else.
Although it seems like Satoshi doesn't care about Mary anymore (as he has Shizuka now), that bitch deserved a good punishment, but didn't get one.
Also, it's obvious that Arato couldn't make submit Mary to him, as we can understand, cuz she was pretending to be feel good and broken while she was fucking with Arato. Here is the question 1. Why Arato didn't go after main character and Shizuka? Cuz knowing him, he definitely the type to do this. Why he didn't want to get Shizuka again? Or why did not try to get Satoshi arrested? He could totally do it, cuz he has the evidance that main character drugged his uncle. So interesting choice by Arato. Humbled by Mary? I really don't think so.
Also for Mary, it is obvious that she looks for sex all the time now. She drops the school and goes after various guy for enjoy and pleasure, but certainly couldn't replace Kendo. She didn't and still doesn't care a bit about Satoshi, that's why Satoshi's revenge is a failure on him. But the question is... How will she react when she learns Kendo has a sexual dsynfuction again? Will she still be able to love Kendo? As a sex mad nympho? I believe the answer is "no", cuz Kendo would try to get back her if this wasn't the case. But I'm not sure. I would like to see her reaction on Kendo's sexual dsynfunction.
As I only have interest for NTR revenge, I didn't check other endings. Most likely Satoshi gets pathetically cucked anyways. I really hate classic NTR shenanigans and cliches, so I wonder if there will be another revenge ending. If there will be, I'll definitely look forward, as this one felt a little bit lacking.