Hayate Ataka

The "Desire Grand Prix" is a game to protect the peace of the city from the threat of the mysterious enemy "Jyamato", whose origin and purpose are unknown. Each participant transforms into a Kamen Rider and competes to win the game by defeating enemies and saving people. The winner of the Desire Grand Prix will be rewarded with "the right to bring an ideal world to life" as a prize. In other words, only the true heroes who win the competition will be able to realize the world they have wished for.

Shion Hagino is a 29-year-old beauty consultant. Although she has never had a boyfriend, Shion leads a happy and fulfilling life. However, one day, Shion participates in a blind date party and it triggers a flashback where she was rejected by her first love back in high school, who told her, "If you're going to confess, you should at least do something about your appearance". As if drawn back by her past trauma, Shion somehow goes back in time and becomes a 17-year-old high school student again. Using the makeup techniques she has honed, Shion decides to move towards a different timeline as compared to what happened 12 years ago.

The cynical butler, Sora Otosumi lives alone in a mansion with the innocent and carefree young lady, Yuna Mizuki. The two lead elegant lives, but they harbor a secret. Otosumi transforms into Kamen Rider MY-TH to fight mysterious monsters known as Fukashigi, and effortlessly defeats these creatures like a mouse. Around the same time, the Zyunishi Doumei (The Twelve Animal Signs Alliance), who also fight the Fukashigi, awaken from their 100-year slumber. Their leader is none other than a cat?! The alliance has begun to realize that their prey is being stolen. The battle between mouse and cat begins now!