Two years ago, Shibuya was ravaged by a biological terrorist attack using the deadly Ua virus. Maria Osawa was saved when her father inoculated her against the virus, but is left with partial amnesia from the shock. Now working as a cameraman, she reunited with her friend Canaan in Hong Kong. Canaan is an assassin gifted with synesthesia, and she's being targeted by the terrorist squad Snake. Meanwhile, numerous groups converge on Hong Kong, all after either Canaan or Maria.
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