Yuki was part of the group of Black Delmo led by Black Delmo Leader which attacked Aika and Gust in the underground parking lot. She and Sae charged Aika together at the beginning of the fight, but both girls were quickly put down without much effort. Sae opened with a blunt frontal attack, which forced Aika to face her first. However, she missed her one hit and was then met with an untimely end as the salvager counterattacked by hitting her square in the head with an electric baton, crumbling to the floor out cold. As Aika unceremoniously dispatched Sae, Yuki tried to surprise her from behind, but the salvager was too fast and quickly turned to face her new opponent. Before the Delmo could even attemp to make a move, Aika buried her electric baton deep in the girl's stomach, causing her to bend at the waist in reacion to the impact before falling backwards unconscious. [1]

Later she is seen in Trial 5 during unsuccessful attempt by Delmo Corps to eliminate Aika during her vacation at Peroronka Island. She, Sae and Ai lured Shuntaro Michikusa to a trap and captured him. After some time Yuki appears again, as she stands beside a pool together with Sae and tied Rion Aida and Shuntaro. She kicks Shuntaro to the water, while Sae does the same thing to Rion. However, Aika suddenly jumps from the hotel balcony down to save her friends from drowning, and attacks the two girls. Yuki tries to attack Aika, but Aika grabs her, and throws right to the pool.[2]

Yuki was seen once more in Trial 6 along with Misaki who were supposed to be on guard duty and on alert if they were to encounter Aika, but unfortunately for these oblivious young ladies, they ended up falling at her hands. While the two were talking, the salvager was able to disable Misaki by darting her right in the ass which sent Yuki in a panic though she herself would quickly fall prey herself as Aika's next dart pierced her left nipple rendering her unconscious in a couple of seconds.