- "You're one of those bad men that my Aunt Asuka watches movies about, aren't you?"
- ―Yuka to Mike
Events of GTA Advance
At the end of one school day she is kidnapped by Mike, working on orders from Colombian Cartel leader Cisco, who planned on using her to blackmail Asuka. Asuka, however, contacts Mike and, unaware of his role in kidnapping her niece, has him rescue a grateful Yuka. Following his success, Asuka begins to employ Mike but later leads him into an ambush with the Mafia, suggesting that Yuka may have informed her aunt of Mike's involvement in her kidnapping. Asuka, concerned with her niece's safety, sends her back to her father. Yuka's kidnapping also appears to have influenced Asuka, who later has Claude cut his ties with his former employer, Salvatore Leone, by killing him before allowing him to work with her.
- GTA Advance
- Yuka is possibly in her late teens, as she expects her limo, suggesting she may be a high school student (judging by her school uniform) or a graduate student.
- Yuka is the only known member of the Kasen family who is still alive.
- Yuka shares some similarities with Johnny Sindacco, as both of them are junior relatives of criminal organisation bosses who are first intimidated, then rescued by the protagonist.