A mysterious young man bearing a circular lump on the back of his left hand, Jin was a result of the Z.E.T. Project by the Amagi Corporation to create the perfect being to fight and destroy the escaped Players. He was however released by Gorou Kanzaki, who wanted nothing more for Jin than to grow up as a normal human. Jin is able to transform a creature known as "ZET", a mutant possessing superhuman abilities, but often mistaken for another Player. The transformation is slow, though it may be accelerated due to extreme rage and conditions.

The main character is a large man with an even larger heart. He remains calm and only loses his cool when his friends are hurt. When he speaks most people can't help but feel overwhelmed and see the error of their ways. He saved Hinako from Kiriu Touya and became the banchō of Chiyoda district. He helps the little guy and doesn't care about being powerful or rich. Besides his desire to destroy the District Plan he seems happy just enjoying the simple things. He goes to Raimei Senior High School, and follows what he calls simple logic (someone hurts your friend you hurt them back). Besides his fighting knowledge and schoolwork Akira isn't very knowledgeable of technology. His strength and massive build makes delicate work hard for him. Besides taking down other Banchos Akira also helps those in his district with their problems. The power of his punch easily exceeds 40 tons.

Zet