Eiji is an assasin ninja from the feared and respected Kisaragi clan. Eiji has learned since he was little, the killing arts of the Kisaragi, and he also became an expert in teletransportation, as well as being able to wield two blades in his hands like if it where his own. Eiji eventually became a cold blood killer, and would work for anybody who paid him enough money for his services.
Eiji still held one personal grudge, though. His family had been in war with the Sakazaki family for some time now, and he has decided to end the rivalry now, with their deaths! He once traveled to Southtown to kill them all, but found no one in their dojo. That's where Eiji learned of the King of Fighters tournament, which the Sakazaki clan is participating. So, the rumors in town where that Billy Kane, Geese's personal bodyguard, was looking for some teammates for his team for the next tournament. Eiji saw in this a perfect opportunity to face the Sakazaki family one last time. After the tournament, he would know how to take care of the "pests" he had for teammates. But he had overlooked the new Yagami fellow...
Eiji fought like a authentic killing tornado, using his stealth techniques, and bone cutting techniques. However, he never could get a clean shot against any of the Sakazaki family. When he was about to escape and go search for them on his own, Iori appeared in front of Billy and Eiji. Using some unknown techniques, Iori defeated Billy and Eiji in a very bad way, and left. However, Eiji did survive the encounter with Iori, and after that, he has desperatly sought for another chance in the tournament. It is unclear if Eiji wants to enter to kill the Sakazaki family or Iori...
Eiji is ruthless, unsensitive, and heartless. For him, human life has no
meaning, and will not doubt in killing any person, of any sex, and of any age.
His cold eyes, and his mortal silence truly makes him sinister at first sight.
He is also very skillful at dispatching several people at once. Few people know
his past, but all remain silent, fearful of Eiji's fury.