She may hold the same last name as Youta, but Yuki actually lost her memory and thus, has been staying at Youta's house for the past six months. Not only is she bright, but she is quite straightforward; she has been a tad out-of-touch with society due to her memory loss so she can come off as clumsy at times. Yuki seems to be quite interested in historic ruins and ancient civilizations.
Dynasty Warriors[]
After the final battle against Jisuperu, Yuki remained alive and well. She started a housekeeping job. She witnessed the truth that the Dark Lord Empire Federational Apocalypse-United Villains is attacking countless universes. She and Youta must join forces with the heroic faction that is based on Knights of the Round Table known as Knights of the DigiDestined led by Kamen Rider Decade.