Looks like you added a little plot hole. It said earlier that as long as a girl was beautiful and a vrgn, the MC would have her in his harem, but Shiori—although she may become beautiful later—isn’t a vrgn.
forcibly adding a character to the novel. will people evolve or become stronger in the apocalypse? Will the other person become a burden to mc? Will there be a risk of betrayal? Let mc find a way to steal the other side's ability. If you're going to write evil mc, write real evil mc.