Ouchi e Kaerou: Neko Mimi Omegaverse

Shiina and Aoi are a romantic Alpha and Omega couple who live happily together with their little son, Noel. Protected and sheltered by his parents, Noel is unaware that his family is different from any other until he one day accompanies Shiina to work and notices something strange. Why is it that he and Aoi are the only ones with cat ears?