Dead or Alive 4 - Kasumi

Dead or Alive 4 focuses on the story of Helena Douglas taking over the mantle of the Dead or Alive Tournament Executive Committee as its second chairman, determined to fight against the corruption in the organization. After losing both her father and her beloved mother to the darkness of conspiracy, Helena chose to place herself in the middle of the maelstrom in order to put an end to the chain of tragedy once and for all.

The man who holds the true power at DOATEC, Victor Donovan, locked himself in the Bio Lab Core again to continue coveting his dream of creating the perfect human weapon. His new project, code named "Alpha-152", is the result of the ultimate evolution of hyper-cloning technology, birthed from a DNA sample of Kasumi.

The main storyline continues with the war between the Mugen Tenshin Ninja Clan and DOATEC. After Ayane successfully defeats DOATEC's last creation, Omega, Hayate returned to the Mugen Tenshin clan, taking over the leadership. Now leader, his heart burns with the desire of revenge as he goes on a quest to put an end to DOATEC for the innumerable pain the Ninjas have suffered from the organization. During the fourth tournament, Hayate brought together the most powerful group of Ninjas known to man. He is accompanied by Ayane, Ryu Hayabusa, and other members of the Mugen Tenshin Clan; Kasumi, though reluctant, is dragged into the events herself as she follows her brother.

The ninjas attack DOATEC's primary headquarters, the gigantic Tri-tower buildings. Other competitors such as Brad Wong, Eliot, Jann Lee, Kokoro, Leifang, and Zack were also among the chaos during the assault. Hayate is confronted by a luchadora named La Mariposa who reveals that she manipulated him into coming to destroy DOATEC. Hayate thanks her and he battles her to return the favor. Bayman vowed to finish off Donovan, Hayate also states his reasons for wanting revenge on the mad scientist as well. Bayman tells Hayate not to interfere in his revenge but Hayate states that he cannot let him fool things up while the ninjas proceed with their assault. La Mariposa reveals to Helena about her involvement in DOATEC's Epsilon project before the second tournament and Hayate coming to DOATEC. La Mariposa resents Donovan and wants to put an end to his motives. Helena reveals to her that there's no way now to stop Alpha-152 from awakening now that her shutdown mechanism has been destroyed and only one option is left to stop Alpha. Kasumi confronts Helena, telling her to stop the fight between DOATEC and the Mugen Tenshin. Helena refuses, stating that Hayate and the others will stop at nothing until DOATEC is destroyed, and she is willing do anything to stop Donovan and Alpha-152 from causing havoc in the world. Helena attempts to shoot Kasumi but she is saved by Hayabusa. Helena is later confronted by Christie who reveals that she was her mother's killer. Almost breaking down in sadness over her loss and now boiling with anger, Helena fights Christie.

The ninja assault left the Tri-towers in an inferno, and the buildings' auto-destruct sequence activated by Helena lead to the buildings' ultimate destruction. Helena tries to commit suicide by willingly letting herself be consumed by the flames of the burning buildings. Suddenly, Zack came flying in with a chopper, saving her before the Tri-tower buildings fell to dust.