Yankii Omega wa Yakuza ni Ochiru

Hajime is a yankee student who doesn't get along with his free-spirited mother and spends his days hanging out with his fellow delinquents. When he tries to go home for the first time in a while, he gets abducted by a yakuza who was hanging out in front of his house! He learns his mother had borrowed money from the yakuza and was behind on repayments. Mizuki, the young alpha leader, sleeps with Hajime to judge the beta's quality, but the pheromones of an omega begin to overflow from his body..!!?