A magician from a family of magicians, she is contracted by Abidani to defeat Tomu, for her unparalleled sleight of hand tricks, which makes her think that she can't be beaten at any card game. She is Tomu's third challenger and bets against Tomu on a game of Black Jack.

It is revealed that she wants to defeat Tomu because gamblers use similar tricks to magicians and that, due to her older brother's death, she feels magic is the only way to be close to him and is almost sacred. However, her ego gets the best of her in the belief her skill surpassed his, and despite Abidani's warnings, practically flaunted her cheating ways and gave Tomu too many chances. Tomu sacrifices a finger so that she can't shuffle the cards because the blood stain would not match up.

At the end of the match Tomu's act of stopping Yuka from sacrificing her finger, as they are a magician's life, reminds her of her late brother and as such seems to have developed feelings for Tomu, and doesn't hesitate to flirt with him at any possible chance. She later becomes a member of Tomu's three man team against the Abidani Seminar Students for the Dice Game, revealing she also knows many cheating ways with dice. She also practices knitting as a way to strengthen her fingers.