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Dreamcast - Project Justice cheats

Unlock Hyo Imawano in arcade free, versus and training mode
and Dark Side Student Council in story mode:
Finish story mode with each normal schools. 

Unlock Powered Akira as playable character:
Play with Seijyun Syogakuen in story mode. Beat Wild Daigo without using
a team up technique.

Unlock Roy Bromwell and Tiffany Rose as playable character:
Play with Pacific High School and finish story mode.

Unlock Vatsu as playable character:
Play with Gorin Koukou and finish story mode.

Unlock Wild Daigo as playable character:
Play with Gedo Koukou and finish story mode.

Unlock Kurow as playable character:
Play with the Dark Side Student Council and finish story mode.

Unlock Demon Hyo as playable character:
Play with all schools and endings and finish story mode.