
That kind of ending makes me regret ever reading this to begin with.
I mean one mentally weak and deprived main character, one twisted character, and one character that gave up twice on the person he supposedly loves. And by the end of it nothing changes? There was no character development whatsoever? Not one character "grew" personality wise? Not one character over came his supposed character defects?
This manga had so much potential that was just wasted, thrown out the window straight into the garbage.

When is Azusa gonna catch a break around these freaks? It's like the whole notion of just being a "kind" person has completely disappeared from these guys dictionary, I mean how can every single one of them have two faces, one for school and one for their family?

Quite easily, given that one is an artificial environment where the participants are forced to conform to certain roles and social norms.
Such structures of dominance and bullying aren't exactly unknown, in England in the fee paying school system there was this https://en.wikipedia.org/wiki/Fagging.
The face people have to their family is not going to be the one they put on when involved in the "Caste system".

Link didn't work, here should be the correct one. https://en.wikipedia.org/wiki/Fagging
Obviously the "Caste system" is more brutal, but anyone from the UK will be aware of similar hierarchy structures that such were found in closed environments like public schools. If you haven't seen the film "If...." which was made in the 1960's it focuses on this structure in a fee paying school, rape of those that were "fags" to their superiors (sorry the term is offensive, but that was what such a role was called) as is happening in this manga.

Wait wait wait, I hope Christoph isnt forgiven for any of this, he caused the death of Lucaons' parents, and after years of living in this group company still poisoned Lucaon? So what he refused to go back but he still POISONED HIM!!!

Edwin said the only order that Christoph disobeyed was that when he was told to return with them. So, either Christoph did it, or he wasn't the one to whom Edwin ordered Lucaon's poisoning. I wouldn't be surprised if it was number two and Edwin was just trying to make it look like Christoph was responsible for both poisonings, as a way to mess with Ryan's head.
You mean it's been 10 years and that's all he had to say???
Which one? Lol
All Yamazaki had to say was "I like you" for them to be together...
After 10 whole freaking years...