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Gaisei is the legendary warrior that trained Kaede, Yuki and Moriya Minakata. After Shinnosuke Kagami’s aborted plan to remove the seal on “Hell’s Gate” and bring about a new world order, Gaisei presumably stood up against the guardian in an attempt to stop him. Unfortunately, Shinnosuke is too powerful, and he dies in the battle. He is later discovered by his three students, who all vow to take revenge on his killer. Kaede accomplishes this, activating his power of the Seiryū and defeating Shinnosuke. This also clears Moriya’s reputation, as he was originally blamed for killing Gaisei.
In The Last Blade 2, Gaisei is still deceased. However, an unknown force of evil resurrects him and drives the now-undead warrior insane. Additionally, he manages to combine the legendary powers of Suzaku, Seiryū, Byakko and Genbu into his being, making him much more powerful than before. The now godlike warrior roams the lands and is called "Kōryū.