I understand where you are coming from, but we are not at the end of the story yet.
I think (again - no foreknowledge of the ending) that when the MC 'wins', he will be able to pick one/several of the women to live out his life with in the 'new' world.
I am actually hoping for the option to bring both Mira and Apollyon with the MC to the new reality that is created due to his efforts.
We've seen most of the women develop an affinity for either a strong friendship or a bit of polyamory for other women in the story, so I feel like throuple endings are a possibility.
I don't know this OC - but it would make the journey Very rewarding to end up with several of the women who the MC tried so hard to save.
For now, I am just enjoying the story and the evolving relationships with the different women.
Cheers!!