A black cloud hangs over Ken and Ryu's reunion. Brought together by the mysterious death of their master, the two warriors must overcome a challenge unlike any they've faced before. Increasingly troubled by the dark energies building up within him, Ryu has an unexpected encounter with Shun - a buy who claims to be the long-lost brother he never knew.
Soon, signs of their comon lineage are revealed as Shun enters a local martial arts competition and displays the same power of the Dark Hadou, that Ryu himself knows he has within him. But before Ryu has the chance to consider whether or not Shun's appearance might be more than a coincidence, the boy is kidnapped by agents belonging to insidious Shadowlaw organisation. In order to recover Shun, Ryu realises that he must undertake the ultimate journey of self-discovery and learn to control and channel the power that threatens to consume him.
However, with his confidence waning, does Ryu have what it takes to confront the all-powerful Akuma- the nihilistic lord of the Dark Hadou himself? Find out as allies both old and new, join forces to combat this new threat!