Short answers, pulled from the story.
Street Fighter Alpha: Generations is a 2005 Japanese anime film produced by A.P.P.P. and released by Manga Entertainment. It is based on the 1996 video game Street Fighter Alpha 2 by Capcom and was made specifically for the English-language market.
Japan did not receive an official release until 2009, when the film was included as a bonus feature in the Japanese DVD and Blu-ray release of the live-action film Street Fighter: The Legend of Chun-Li.
The Satsui no Hadou is described in the film as a mysterious and evil life force that dwells within certain fighters. The old man explains that it grows stronger as it is exploited until it consumes the fighter entirely, and that it is so ancient even warlords once knew of its existence.
Richard Cansino voices Ryu in the English-language version. The Japanese voice cast includes Yasuyuki Kase as Ryu and Daisuke Gori and Yasunori Matsumoto sharing the role of Gouki.
Street Fighter Alpha: Generations earned a 52% score on Rotten Tomatoes, placing it in "rotten" territory. The film was not as successful as its predecessor in the Street Fighter Alpha anime series.
Gouki kills his master Goutetsu using the Raging Demon technique at the opening of the film. He then takes Goutetsu's beaded necklace before leaving the scene.