Ninja Kamui

Joe Logan lives with his wife and son in the suburbs of a near-future city when, one night, their house is attacked by a gang of masked assailants. Although Joe skillfully defeats several of the invaders, he is fatally stabbed after seeing his wife and son get killed. Somehow surviving, Joe wakes up in a hospital where he is visited by FBI agents Mike and Emma, who ask for his help with their investigation. However, that night, more ninjas clad in black come to assault him. Joe fights back and kills them one after the other until only their boss is left, who tells Joe that the ninja organization will never stop hunting him. Joe leaves the hospital and returns to his home, which he burns to the ground. As the flames of vengeance consume him, his face no longer bears any resemblance to Joe Logan.

Higan, formerly Joe Logan, hangs the boss ninja upside down in an abandoned house and interrogates him. The ninja clan originally served Japan, but global affairs and a change in leadership have now put them under the flag of a more powerful country. Higan learns that a string of recent murder victims were in fact all former ninjas who had their covers blown and got eliminated for being “exiles”. Higan kills the boss ninja and swears to take revenge for his dead wife and son by crushing the organization. However, as he searches their old hideouts, his discovers they have all been left empty and abandoned. Desperate for leads, Higan contacts Mike, the FBI agent he met at the hospital. Without divulging their true intentions, the two of them agree to meet a Chinese restaurant, but they are quickly attacked by assassins. This ends up giving them the first clue that the global corporation known as AUZA may be involved behind the scenes.

Yamaji, the Chieftain of the ninja clan, addresses questions from one of his lieutenants named Lil. They discuss how Higan survived after being killed in their initial attack, and why the ninja known as “The Reaper” hasn’t been tasked with eliminating him yet. Yamaji has his own ideas on how to handle the situation. Meanwhile, Mike realizes that the top brass of the FBI are trying to sweep the case under the rug and decides to join forces with Higan. Needing someone with computer skills, they also get Emma involved and launch their own independent investigation into AUZA. They start with AUZA City, an experimental city where a new form of energy is being tested, and also where AUZA’s headquarters is located. However, it’s not long before a new assassin attacks Higan, which causes Mike and Emma to get into an accident. After going back into hiding, Higan gets a call from a mysterious benefactor.

The mysterious benefactor warns Higan that it’s impossible for him to infiltrate AUZA City without any help. Meanwhile, Mike and Emma walk away from the accident with light injuries and relaunch their investigation into AUZA and the ninjas. Little do they know, but the AUZA CEO, Joseph, has already forged a partnership with the ninja organization. As it stands, the clan has embraced a new way of operating and hardly resembles how it used to be. In the past, Higan, Mari, and Zai were trained by the clan and showed immense promise as future leaders. However, Higan and Mari broke the ninja code by falling in love, which totally changed their relationship with Zai. Back in the present, Higan infiltrates AUZA City by following a route provided by the mysterious benefactor. But just as Higan is about to breach the last barrier, he is confronted by Zai, aka The Reaper, who foresaw his arrival.

Continuing his investigation into the ninjas, Mike uses information from Emma to track down Jason, a former AUZA employee. Jason has a vendetta against AUZA and agrees to help Mike by hacking into one of their websites. Among the data they steal, Mike unexpectedly comes across Emma’s name, but AUZA traces the hack and sends mercenaries to shut them down. Elsewhere, after having his first attempt to infiltrate AUZA City stopped by Zai, Higan learns of an alternate route from the mysterious benefactor. Higan chooses to take it, despite knowing that it’s a trap, and gets confronted by the ninja organization’s lieutenants. The lieutenants are equipped with high-tech battles suits called “Gusoku Gear” that give them immense power. The situation looks dire as Higan gets overwhelmed, but before Zai can deliver the final blow, one lieutenant named Aska does something that surprises everyone.

Aska rescues Higan from certain doom and treats his wounds. It turns out that Aska is Emma, a ninja who not only had been sent to infiltrate the ranks of the FBI, but also was the mysterious benefactor that helped Higan. Now that her betrayal of the organization is known, she rushes to prepare a Gusoku Gear for Higan as it’s their only hope of fighting back against the ninjas. Aska explains that she had a special relationship with Higan’s wife, Mari, and actually tried to help her on the day she died. However, she was only able to save Higan. Meanwhile, Jason saves Mike’s life and takes him to a doctor. Mike then learns that he is now wanted by his own agency, the FBI. The ninja lieutenant named Lil finds Aska and Higan’s hiding place and attacks them, forcing Aska to fight back. She desperately tries to stall for time until Higan’s Gusoku Gear is ready.

As Higan and Lil engage in combat, Higan achieves complete synchronization with his Gusoku Gear, known as “Kamui”, and uses its power to defeat Lil. Afterwards, he sends Lil’s severed head to AUZA’s headquarters as a message of his intent to crush the organization. This prompts Yamaji to finally order Zai to eliminate Higan. While talking with Aska, Higan learns many different things: That Mari was Aska’s mentor and someone close enough to consider family. That Aska had been given the task of serving as watcher within the clan. That Mari had confessed to Aska about her relationship with Higan. And finally, that Aska witnessed the drastic change in the organization and decided to continue observing it from the inside after the exiles were purged. Throughout all of this, Aska had continued to stay in contact with Mari.

The CEO of AUZA, Joseph, dreams of taking total control of the country’s energy infrastructure and has been using Yamaji’s ninja organization like a private military to force his agenda through. Determining that the clan had been corrupted beyond saving, Emma makes it her personal goal to stop them with Higan’s help. She goes on a risky mission to infiltrate an AUZA facility and steal an energy tank for Higan’s Gusoku Gear. Meanwhile, Jason and Mike are still on the run, but have the idea of using the computer in Emma’s car as a way to continue their investigation. Thanks to that, Higan, Emma, Mike, and Jason are finally able to assemble in one place. Although Mike struggles to come to terms with the fact that Emma has been lying to him the whole time, the group unites with the common goal of bringing AUZA’s conspiracy to light.

It turns out that AUZA and the ninja organization are not totally on the same page. At some point, friction began developing between Joseph and Yamaji. Worse yet, the ever-impatient Joseph is getting increasingly frustrated after multiple accidents at AUZA facilities have given government officials cold feet in cooperating with him. Emma and Jason combine their efforts to launch a hacking attack on AUZA, which results in them obtaining a ton of top-secret information. Meanwhile, Mike and Higan fend off a squadron of mercenaries sent by AUZA to stop them. Things take a turn when another ninja lieutenant, Big D, shows up and demands a duel against Higan. But unbeknownst to any of them, Joseph has rigged Big D’s Gusoku Gear with a bomb, which promptly explodes after Big D loses.

When Zai was very young, he was caught and imprisoned by human traffickers, but later freed after Yamaji and the clan wiped out their syndicate. That was when Zai joined the ranks of the ninjas. He was emotionally scarred by the experience and developed a strong distrust of others, which didn’t start to heal until he forged a friendship with Mari and Higan. However, Zai was left with an even greater scar upon his heart after those two abandoned the clan. Higan mourns Emma’s death in the aftermath of the explosion when a letter challenging him to a duel arrives from Zai. Mike and Jason want to leak the top-secret data they hacked from AUZA to the public but discover they can’t because Emma’s external memory drive has encrypted it all. At the same time, AUZA gets the upper hand by having Emma, Mike, and Jason get reported as terrorists in the news. Mike decides to negotiate with his boss at the FBI to try and break the deadlock. Elsewhere, Higan and Zai begin their fated battle.

Higan wins his duel against Zai, but stops short of killing him and leaves. Meanwhile, Joseph sends his mercenaries to attack the ninja hideout after cutting his ties with Yamaji. However, Yamaji knew to expect this and counters by sending his ninjas to take control of AUZA headquarters. Joseph is left with no choice but to desperately flee from his own company while Dilly, one of the ninja lieutenants, continues to serve as his bodyguard. Joseph and Dilly are confronted by Yamaji. Elsewhere, Mike figures out the key to decrypting the data Emma left behind. So Mike and Jason use it in one last gamble.

Dilly adheres to her orders and protects Joseph by choosing to fight Yamaji. Higan has a surprise visitor who earnestly pleads with him to put an end to the tragic contradictions of the ninja clan that has remained trapped by history.