I think that there was a common enemy for three families ZPR, so they formed an alliance to go against it. In the end, the alliance won, but as a result, a retaliation or a revenge plot against them might have been enacted, and Sasha might be a victim of it. That's why she trains martial arts, has a bodyguard and mental trauma. Her scar caused by sexual assault in the past might be plausible given the context that her charm ruined several marriages, but if so, she must be very uncomfortable around men. The game shows none of this, so I assume that is not the case.
Nami may very well be involved with these families. She has one of Leia earring, her parents died in a car accident (which sounds pretty set up), and Katie Zane came to check on her, knowing that she will attend that book club. Now, there isn't much known about Nika; his parents also died in a car accident. He mentioned an uncle taught him how to play basketball, presumably William, that was when he was in Noji's custody, so William may be just checking on Nami, or he could also be involved with the mafia stuff, I don't know. Okay, how does that sound, guys?