First of all this has been one of my absolute favorite games thus far. so here is what i percieve is going on. The cyborg comes from an alternate reality from the earth mentioned in the very beginning of the game, where technology has gone to far. Humans of thay earth created something that caused damage to either the flow of energy or a rift between the dimensions of that reality. Causing most magical life to go extinct. i feel the cyborg was sent to prevent us from sufforing the same fate. Its something that is about the be tested on the station. I would say he lost his arm because he was trying to pull his father through with him when the portal closed severing his arm. I could go further and suggest ways of accomplishing it, and how there could be multiple endings depending on the choices made.
As for the current game as it is the storylines for Sam, Keira and Yuki where very touching and heartwarming. It was a bit of a pleasant surprise. Most of the games like this i just click through to get to the sex scenes lol. this game on the other hand I was captivated by the story and the level of emotion involved. Do you be a hoe and break everyones heart or actually love someone, but who. The one thing I must stress and can't stress enough is if the do decide to do the mind meld thing let it only be memories shared not a link causing either one to lose thier sense of self. Even if its a flash bace and forth scenario i would rather see seperate lives and having the mc continue with the school. To fird out what really happened to his father and why. Also the whole vampire situation.
Sorry for the book of a reply.