Aiko was a Slayer who worked who led the Tokyo based Slayer regiment in Buffy the Vampire Slayer Season Eight storyline "Wolves at the Gate".

She was contacted by Buffy's Scotland-based Scooby Gang (of Buffy, Willow, Xander, Dawn, Andrew, Renee and Satsu) after a cabal of Japanese vampires stole Buffy's scythe: the source of the Slayer powers after Willow's spell in "Chosen" activated all the potential Slayers in the world. Buffy, fearing these vampires - who possess unique magical abilities stolen from Dracula - play to reverse Willow's spell.

It was Aiko who discovered the Japanese vampire clan's leader's name: Toru. She trails the vampires, but they are aware of this and ambush her, and test their spell, succesfully removing her Slayer powers. Her lifeless body is left hanging from a building in Tokyo as a message to Buffy.

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