Mikiya is the father of Akane Awakusu as well as the son of Dougen Awakusu . Due to the fact that his elder brother wished to pursue a non-Yakuza career, Dougen decided to make Mikiya the next heir to the Awakusu . Many members opposed this move, mostly because Mikiya had yet to produce any noteworthy achievements despite his long time involvement with the awakusu. Because he is regarded as a "Weak link" in the awakusu, Mikiya is eager to prove himself and follow in his father's footsteps.

Things are further complicated when Akane runs away from home and Mikiyia devotes most of the awakusu members under his direct command to locating his daughter. It is implied by Shiki that Mikiya's love for his family is merely an act to earn the support of the other awakusu members as well as to secure the next heir when it comes time for him to chose one. His reputation is further damaged when it is discovered that three of Mikiya's subordinates were murdered with Shizuo Heiwajima being the prime suspect.

Mikiya first appears in Volume 06 at a meeting between several Awakusu executives. He expresses anger over the fact that his daughter has yet to be located along with frustration over the murders. Mikiya isn't seen again until Akane has been located. Shiki brings Akane to him and Mikiya embraces her, tightly, on sight. Shortly after their reunion, Mikiya and Shiki notice a flash grenade thrown by Slon and immediately shields Akane from the flash. Mikiya tries to fight Slon but is easliy shoved aside. At the end of the novel, it is revealed that it was Mikiya who orchestrated the murders due to the fact that the three victims were actually spies from the police and rival organizations. Mikiya is last seen fuming over Slon's "betrayal."