Unexpectedly not unique enough. The theme is similar to Confinement King and Juujika no Rokunin. It's average. I feel like most people just hate the NTR part without reading it and give low score because of that.
The premise sounds decent but its just some slow drawn out burn.
Most people I see citing wanting a "revenge NTR" plot seem to want a MC actually becoming an even more vile version (or go full gymcel while plotting revenge) of the bullies rather than being gamma-male with superpowers. Or the NTR at least causing him to be at least somewhat more aggressive.
They'll have him remain one of the most overused MC tropes for the cucked character, there's no sign of him doing much other than weakly using powers in a halfassed fashion.
Sure it's early, but this work feels like its basically "here's NTR rape that breaks the MC, gets powers he can use now enjoy him using them in the least vengeful manner in some confinement arc that will last 20 chapters if it doesnt get dropped completely"