Canaan, a covert agent with the power of synesthesia (the ability to combine senses), arrives in China just in time to save her friend, the young photojournalist Maria Osawa, from a deadly attack by the terrorist organization known as Snake. But Canaan has tenuous ties to various Snake operatives, which places Maria in peril.

After saving Maria and Yun Yun from Alphard's trap, Canaan decides to end their rivalry once and for all. And when Alphard finds out Canaan's inner truth, her own existence is shattered--as is her perception of their mentor and what he meant to them both.