In this thrilling prequel to Street Fighter Alpha, Ryu returns to pay homage to his deceased mentor, but is tormented by disturbing memories of his master’s killer. In a quest to become a true martial arts master, Ryu sets out to hone his street fighting skills and to deliver himself from the haunting legacy of the Dark Hadou. But the ultimate test of his new power can only be accomplished through one last fateful confrontation with his arch-nemesis, Gouki.
The 'Alpha' subtitle is really misleading as this anime bares very little to the game of the same name. This story starts 25 years before Ryu, and concentrates on Goutetsu teaching his two disciples, the brothers Gouken and Gouki.
Gouki is frustrated that Master Goutetsu is holding back, and Gouki wants to know how he can use this strange more powerful hadou. As Gouki trains with Gouken he finds himself getting stronger in the battle but often collapses after the fight. Goutetsu knows the reason, he is losing Gouki to the dark hadou.
With Goutetsu refusing to teach Gouki, Gouki takes on Goutetsu and kills him, taking his bearded necklace in the process. Gouken is distraught and promises to get his revenge on Gouki and continue his masters training.
The rest of the story we know, and the anime picks up Ryu as he is coming back for the anniversary of Master Goukens death. However someone else has also returned, and is ready to take on Master Gouken's diciple.