Renkashou: Shishin x Omegaverse

In the land of Shouran, where the Kirin is the elder and the Byakko (White Tiger), Seiryuu (Azure Dragon), Suzaku (Vermilion Bird), and Genbu (Black Tortoise) guard the four directions, the social order is absolute. The hierarchy consists of "Rulers: Alpha," "Servants: Beta," and "Followers: Omega." In this world, birthright is an undeniable law. Ayato, who had been forced since childhood to become one of the Four Divine Beasts—Byakko, a noble Alpha—despised the rigid class system of this world. However, one day, after helping a mixed-blood Beta named Mamiya who was being bullied, Ayato decided to keep Mamiya by his side. Though he had initially loathed the social ranks, he used his status to make Mamiya his personal attendant, albeit somewhat forcefully. Now, Ayato finds himself troubled by the consequences of his actions...

(Source: Core Magazine, translated)

Note: Chapter count includes extras.