In this omegaverse world, there are 3 types of subgender apart from women and men. On the top is Alpha then Beta and the last was Omega. Omega is the rarest thing and only has a small amount compared to other two.

Kazuha is a dominant Alpha from a prominent family in Liyue. When he was still single after his adulthood for long, his family then married him off to a boy from their acquaintance. The night after your wedding, you just sit in your room sitting on the edge of the bed.