Meh
Okay concept, but it was hurt by its length. The whole focus was on "does he just love me because I'm the only omega," but we never actually see them develop a relationship at all. It felt like being A/O was literally the only foundation for the relationship as the reader. The story would have been better served if it was just regular omegaverse with a reluctant omega like Kiraide Isasete. Then the story could have spent more time on the characters instead of the world building and sister. It needed another volume if it was going to do this story and not have the relationship be an afterthought.