Usotsuki Omega ni Oshioki wo

Kakeru of the Asagiri family, who has served there for generations, and Kaname, the son of the Ichijo family, have loved each other since childhood. The two promised to get married when they grow up, but the birth test revealed that Kakeru was an Ω instead of a β, and their relationship was torn apart. However, 19 years later, their destinies take a big turn when they meet again by chance...