She is the ex-girlfriend of Dr. Go! and owns a piece of the photograph that has a piece of the security code needed to get into the KGB base.
Crypto visits her at Zen Temple disguised as a White Ninja to recieve it. While there, Crypto attempts to reunite her with Go!, there are two alternatives: Crypto reminds her of the good times (resiting Hiku) and she is convinced to give it another try. She tells Crypto to find the photo under one of the rocks in Zen Temple and give it to Dr. Go!. In another dialogue, Crypto has nothing to say, so she sends Crypto to find the the photo and give it to Dr. Go! as a reminder.
- Yuki can be found on a small hilled platfrom on Gouka Road, nearby the volcano and below the Black Ninja territory, talking to a man named Akira about the Blisk Spores. She can be killed, although she will always respawn.
- Her model is identical to that of the Takoshimese Office Ladies, although she wears a white dress instead of the brown and red worn by the normal Office Ladies.