Taeko was found and raised by the Oarburghs as an assassin. She was eventually assigned to work with Babara Oarburgh and Chelsea. She was then hired by the Revolutionary Army along with Babara and Chelsea to dispose of the Elite Seven which has been posing a threat to the Revolutionary Army by eliminating its supporters. While staying at a hot spring inn to plan their next move after the failure of their first mission that ended with the annihilation of the Tengu Mercenaries, she meets and befriends Cornelia, unaware of her identity. Eventually learning about her identity from Chelsea, she calls Cornelia out and engages against her in a death match and kills her after destroying the latter's Shingu.