What's Omegaverse?

~Omegaverse~

Katsuki is the only child in his family and born as Alpha.

He been forced by his grandmother to married with female Omega from the noble family, to get all his family's wealth and take over his family business.

The female have to give birth to baby alpha but for some reason the female can't bear a child.

Then, he meet with Izuku, the Omega.