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Raul Mendoza is a former police officer from Tijuana, Mexico. After being framed up and sent to jail during a drug raid gone wrong, an incident which also cost him his right arm, Raul was visited in jail by an anonymous benefactor claiming to be from Orion, who supplied him with a prosthetic arm and an invitation. With nothing else left to lose, Raul accepts the invitation and enters the Sentoki tournament in order to make sense of everything.
As Kei Ikushima reaches the finals of the Sentoki tournament, Ranzou Kihara, who was watching over the tournament, would unleash K-001, a clone created in Kei's image and infused with all of the fight data collected by Orion, upon her. After a grueling battle, Kei was able to defeat the clone and win the match, until Ranzou, not liking the results, decided to restart the match right there and then. As the match got restarted, K-001 proceeded to attack the battered and exhausted Kei in cold blood, delivering vicious blows and strikes, which incapacitated her. She was about to be killed when Shin intervened and fought with the clone. He was eventually able to defeat K-001, but Kei barely survived after all of the injuries she suffered, and was sent to the hospital shortly afterwards. Meanwhile, outside the arena, a mysterious man who goes by the name of "Nixon" watches the entireity of the tournament through some of the TVs displayed on a surplus window. All alone on the streets, Nixon has no memory about his past, living his current life as a vagrant, walking the streets of Tokyo aimlessly and occasionally fighting in underground pit fights as his only livelihood. However, despite his amnesia, he seems to recognize the face of Ranzou Kihara. He dosen't understand it either. He just felt something... oddly familiar about him. It was as if Nixon's mind was drawn to this man, for reasons that aren't clear to himself at all. A rising urge builds up within him: a strong desire to meet Ranzou Kihara himself in order to make sense of his amnesiac mind. Almost a year after the last tournament, Orion would eventually announce the fourth Sentoki: Global Martial Arts tournament. Upon hearing the news, Nixon wasted no time and decided to enter the tournament, his mind dead set on meeting Ranzou, thinking he has all the answers to his past.
