The main protagonist. 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. 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 source of his strength appears to be the mysterious lump on his hand.