The Touken family, with each successive head of the family becoming Kenran Red, fought against the demon army "Youja-dan" as the "Swordsman Sentai Kenranger" alongside four retainers since ancient times. One day, after cornering the Youja-dan emperor Ronou, the five Kenrangers fell into a trap and were separated. One of them, Kenran Yellow/Kasumi Koharu, fought against the Youja-dan's samurai general who stood in her way in order to reunite with her comrades, but was overwhelmed by his immense power and captured. [BAD END]