Ngl, kinda don't like where this going with this girls. It questioning Saito's "superpower" where he can just remember everything in detail, but somehow forgot this girl in those memory. This would make sense if at that time his "superpower" were weaken.
i'm not opposed to spicy relationship and i don't mind that that she is mesugaki or straight up abusive, but i expect that it will be painful to get though unlike with the gyaru where it was nice.