I think it's an RPG, 2D with CG, with combat rape/battlefuck mechanic of a schoolgirl trying to escape school/save the world after they're invaded by burly men, or demons/aliens in burly men form. I'm pretty sure I saw it some times ago here, but I just can't seem to find it now, even with 2d game filters (well, it's possible my eyes just missed it, but I think it's unlikely).