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The Darkside Society Organization ("DSO"), oftentimes referred to as "Reverse Society", is a mysterious organization which acts as the true villain of the Rival Schools series.

Description

Very little is known of this organization, other than their ultimate goal is to take over Japan and eventually the whole world. They have various clans of assassins working for them, among them the Imawano clan. The organization has a simple yet brazen ambition: to rule the world. And successfully taking over Japan would be their first stepping stone of their quest. But, with news of Raizo, Kyosuke and Hyo's defeats and their defection to side with the cause of greater good reach the organization, the plan to the ultimate goal had been temporarily put on hold for a detour mission: to purge all Imawanos to the last seed, whether they were bona fide members of the DSO or not. This means that Batsu and Kyosuke (although illegitimate descendants they still possess Imawano bloodline) would not be spared from the DSO's savagery.

Unknown to the organization itself, one of its members has something else in mind.

Known members

  • Mugen Imawano: Apparently one of DSO's head members and the father of both Kyosuke and Hyo, he have died for reasons undisclosed and his evil spirit was sealed within Hyo's sword.
  • Raizo Imawano: The brother of Mugen and father of Batsu, he defected from the organization for disagreeing with their ideals and founded the Justice High School. Was brainwashed by Hyo in the first game, which kickstarts the game's plot.
  • Hyo Imawano: Son of Mugen and twin brother of Kyosuke, he's been brainwashed by his father since a child as to further the organization's goals. Acts as the main villain in the first game.
  • Kurow Kirishima: An assassin working for DSO, who is sent to dispose of all Imawano clan members after Hyo fails. However, he has his own agenda, seeking to rule Japan all by himself.