Akoya Seishu is a police inspector and the captain of the 44th Riot Squad. He is also a secret vigilante that ruthlessly carries out his brand of justice. He is also the affiliated fighter of Wakasa Life Insurance in the Kengan Matches and represented the company during the Kengan Annihilation Tournament. Two years later, he was scouted for the Kengan Association VS Purgatory Tournament as a representative for the Kengan Association. Akoya is a man who is driven almost entirely by his intense brand of justice. He thoroughly judges evil: no matter how seemingly insignificant the crime, even in hindsight, Akoya executes those he deems guilty without mercy. Because of how mercilessly ruthless and indiscriminate he is when executing his justice, he takes it upon Hiyama Shunka to somewhat curb his tendencies by directing his actions. Adam Dudley likened his vigilantism to Dirty Harry syndrome.