Joe Higan recibe la visita de los agentes del FBI Mike y Emma, que le ayudarán a investigar el asesinato de su mujer e hijo.

Higan averigua que todas las víctimas recientes de asesinato eran ninjas que fueron descubiertos y jura venganza por su mujer e hijo.

Yamaji aborda cuestiones relativas a la supervivencia de Higan. Mientras, Mike une fuerzas con Higan y Emma para lanzar su propia investigación.

El misterioso benefactor le advierte a Higan que es imposible que se infiltre en la ciudad de AUZA sin ayuda.

Al continuar su investigación sobre los ninjas, Mike usa información de Emma para rastrear a Jason.

Aska rescata a Higan de una muerte segura y cura sus heridas.

Higan logra sincronizar por completo su Equipo Gusoku, conocido como "Kamui", y usa su poder para vencer a Lil.

The CEO of AUZA dreams of taking total control of the country's energy infrastructure using Yamaji's ninja organization. Emma makes it her personal goal to stop them with Higan's help. Meanwhile, Jason and Mike are still on the run.

Emma and Jason combine their efforts to launch a hacking attack on AUZA which results in them obtaining top-secret information. Meanwhile, Mike and Higan fend off a squadron of mercenaries sent by AUZA to stop them.

Higan mourns Emma's death when a letter challenging him to a duel arrives from Zai. Mike and Jason want to leak the data they hacked from AUZA to the public but discover they can't due to Emma's external memory drive being encrypted.

Higan wins his duel against Zai, but stops short of killing him. Joseph sends his mercenaries to attack the ninja hideout after cutting his ties with Yamaji. Meanwhile, Mike figures out the key to decrypting the data Emma left behind.

Dilly adheres to her original orders and protects Joseph by choosing to fight Yamaji. Higan has a surprise visitor who begs him to put an end to the contradictions of the ninja clan. Meanwhile, Mike has been captured at the FBI offices.

Higan and Yamaji engage in a final battle. Meanwhile, Mike tries to track down Joseph as he tries to flee the country.