Yukari was picked up by Kyuubi, when she was just a little child. After an amount of time they spend together, she made a terrible mistake by killing her mentors long desired prey.

Kyuubi, who's only reason to live is to search for the strongest enemy, was greatly disappointed and left her.

In the following hundreds of years, Yukari grows into the ultimate opponent to finally face on Kyuubi... and to make her stay with her forever.