Usagi Reijou to Ookami Reisoku

Set in a world where there men and women, herbivores and carnivores, and the three genders of the omega-verse. Alpha, Beta, and Omega.

Owen, an alpha wolf and the son of a duke, and Amelia, an omega rabbit and the daughter of an earl, are engaged for an arranged political marriage. However, due to a traumatic experience in the past, Amelia is a recluse who has a serious aversion to alpha males.

Having fallen in love with Amelia at first sight, Owen tries his best to get closer to her, but...

The story of how a quiet, unsociable (but kind) guy and a crybaby, former shut-in girl get together.