Being a pure blooded alpha, Sano Manjiro, nicknamed Mikey has been chosen to be the sole heir of the Sano Family after his older brother's death. Sano Family was known to be the most notorious mafia group in Japan. Though they have done many illegal and legal jobs around Japan, Sano Family also popular by the fact that the members even the current leader being respectful towards omegas. Since the first time Sano Family been established, they never harmed omegas in one or other ways. Their victims always be alphas or betas. Omegas hold a special position in Sano Family which is why Emma, Mikey's little sister who was an omega, was being respected well by other members. Takemichi was an ordinary middle school students who has a fear towards alphas since he always got bullied by them. All of his friends are either betas or omegas. What if the heir of most notorious mafia group meet this cute little fragile middle schooler omega? And what if both of them are fated mates?