tl/dr
Yes NTR will definitely be in games, avoidable? Yes advised, but you do you.
Swinging no, Sharing no unless somehow broken. If you've ever watched Billions - think of Bobby and Chuck
In this particular case MC got a Girl stolen from him when he was younger. He now has a chance to get back at him. I can tell you that the NTR path of Sam is completely rendered. Reason that it isn't implement is that we didn't want a bad path before a good path is fully implemented, also the focus is Clara atm.
The Set Up for Hello World is however the opposite, Netori, if you want. It's about you getting even, if you want to (don't be the bigger man - it s the only ending already there...).
Power is quite a lot of things, Money, Information, Reputation etc. This is not one of those games where you just have to play, grind and end up winning. No matter what choices you make.
Power or the lack of it has consequences -> PowerPlower