So, one more review post as I just finished Sailor Knights 2 and Haitoku no Gakuen
Sailor Knights 2: has convinced me that Maika is the most generic creator, all of their plots seem to follow the exact same formula. That being said, this was probably my favorite Maika game to date. The routes are all pretty good, there's plenty of betrayal, and the final "both pairs are corrupted but don't know the other one is and they both try to backstab each other" scenario was absolutely hilarious. Not much else to say, if you've played one Maika game you've played them all
Haitoku no Gakuen: Holy crap, this has dethroned Tossen 3 as my favorite corruption VN so far. It had everything I want in a corruption story - the MC is masquerading as a good guy, integrates himself well into the school. Quickly creates a few loyal servants who are also hidden in order to extend his options. Is always thinking a few steps ahead - not only to corrupt the main girls, but also having his nun servant corrupt the general townspeople through missionary work. Each servant still retains some personality - from the loyal and perfect nun Sakurako to the extremely horny Honoka (seriously, stop almost ruining my plans because of your libido!) All the corruption routes are great, Izumi is probably the best since there's a significant portion after she's corrupted where she tries out her new powers. But Yuka is best girl. I only have 3 minor gripes - 1.) no corrupted outfits. Except for the bondage outfit Yuka and her mother wear, there was no "witch outfit" which was a bit disappointing. 2.) The epilogue was really short. You don't even really get to see Maria's corrupted personality, or how she's feeding false information to the witch hunters - I really wanted to see that in action. 3. I know this is weird, but some of the scenarios were a bit too "real" for my liking - gang rape into blackmail I'm sure is a thing that happens in real life more than I'd want to admit, and that was kind of weird to play through. I liked the more realistic school setting, but maybe not so realistic corruption avenues.
All in all though, Haitoku no Gakuen is definitely my favorite corruption VN I've read so far. I highly recommend it. If anyone has other suggestions of games similar to this one, I am all ears!