Something tells me this will go a certain way. Like MC will "brain-wash" and NTR all the girls who "wronged" him or were sisters/mothers/what-ever of the guys who "wronged" him. While not doing a jack shit to help his childhood friend who in the background is NTRed like in typical NTR manga - was raped, then blackmailed for sex, and we already saw in 30ch that she likes the sex with the cute blush faces she made while being railed in cowgirl position. Dude told her that if she bores him he will give her to his friends - so possible gang-bangs like in NTRs are still on the table.
MC will somehow get a revenge on the people who hurt him, but find out that his childhood friend is already gone - destroyed beyond the possible repair point if you will, and thus realize that this whole stuff he was doing was meaningless. Will get rejected by the demon girl and told by her she used him, and this whole fiasco was orchestrated by her (by for example not telling him about his CHF being BMed into sex while he was "revenging").
As people said, the other manga is better plot wise, thou I wont lie, I kinda prefer art style of this one - has more small breasted girls