Ryu's girlfriend. She helps Ryu with running his shop. In the Ninja Gaiden games she was a CIA agent, however, judging by her behavior in the OAV it seems that the authors changed her character. Irene is a gentle and emotional girl. In case of danger, she knows how to pull the trigger but generally she is not a fighting kind of character. Irene is deeply in love with Ryu.    (source: self)

On a dark, late night in New York City, Ryu is chased and attacked by assassins. After disposing of them, he finds an I.D. card for the Friedman Company. The next day, it is announced that Dr. Ned Friedman has discovered a cure for cancer. But after providing no information at his press conference, a reporter named Sarah decides to investigate with the help of her friends Robert and Jeff. When passing by Dr. Friedman's house one day, Ryu hears the voice of a young girl calling for help. When Sarah and her entourage investigate the house as well, they run into their colleague, Ryu. Upon that, they discover Dr. Friedman has been conducting experiments on live humans using biotechnology, and that it may have something to do with the power of the Evil Gods, whom Ryu had defeated in the past. But when Ryu's friend, Irene, is kidnapped, he must dawn his role as a Dragon Ninja once again to defeat this new enemy and save her.
 
(Source: Anime News Network)

Dead or Alive 2 Comic Anthology is the first installment in the Japan-exclusive Dead or Alive anthology comic series published by DNA Media Comics. The comic is a series of short stories featuring the cast of Dead or Alive 2, each illustrated by different manga artists. 
 
(Source: Dead or Alive Wiki)

Japan-exclusive gag comic in the Gamest Comics series, dedicated to Dead or Alive. The comic is a series of one-off short gags featuring the cast of the arcade version of the first game, each illustrated by different manga artists. 
 
(Source: Dead or Alive Wiki)

Irene Lew