Omega no Mukotori

"I'll take an alpha who's weaker than me over my dead body!" Omegan second-in-command Yoshiharu is ordered by the boss of his gang to interview prospective alpha husbands from other gangs. But Yoshiharu is as unruly as a wild horse, and one of the frustrated candidates slips him a drug that forces him into heat. When rescued from the brink of disaster, Yoshiharu is relieved to find out who his true mate really is... but why does he refuse to mate with him...?!