As a result, the Yummy uses Tamura to perform unauthorized surgeries by herself, giving her father a heart attack in the process. Eventually getting Tamura out of the hospital, Kamen Rider OOO fights the Siam-Neko Yummy, almost destroying her as Sagohzo Combo before the Yummy retreats back into Tamura and escapes. By the time Eiji finds her, Tamura is consumed by the Siam-Neko Yummy as he uses Takatoratar to free her. As Tamura manages to discard her pride to save her father, the Siam-Neko Yummy is destroyed by Kamen Rider OOO using the OOO Bash on her.
- Episodes: 13-14, Movie War Ultimatum
- Defeated by: Kamen Rider OOO's OOO Bash (14); Kamen Rider Wizard Flame Style's Flame Shooting Strike (Movie)
The Siam-Neko Yummy makes an reappearance in Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum as one of the revived members of the Monster Army that Wizard faced in his portion of the movie. She was destroyed by Wizard's Flame Shooting Strike when he fired into the crowd of revived combatants without getting the chance to actually fight Wizard.