
The cynical servant Sora Otosumi, lives alone in a mansion with the innocent and carefree young lady, Yuna Mizuki. The two lead elegant lives but harbor a dark secret... that is to defeat the mysterious race of monsters known as the Fukashigi. Sora transforms into Kamen Rider My-Th and defeats these mysterious creatures with his mouse powers. Meanwhile, the members of the Zyunishi Doumei, all sworn to fight against the Fukashigi, have risen from their 100-year long slumber. However their leader is... a cat?! The alliance has begun to realize that their prey is being stolen. And so the battle between cat and mouse begins now!
Episode guide

Long ago, the Twelve Animal Signs formed the Zyunishi Doumei (The Twelve Animal Signs Alliance) to protect humanity from mysterious lifeforms known as FUKASHIGI. Preparing for an inevitable battle against FUKASHIGI, the members of the Zyunishi Doumei entered a 100-year slumber. In the present day, Sora Otosumi serves as the personal Meister of the Mizuki family. To protect the family's daughter, Yuna Mizuki, he transforms into Kamen Rider MY-TH and joins the fight against FUKASHIGI. But when Sora comes into conflict with the Twelve Animal Signs over FUKASHIGI, a new Kamen Rider “myth” begins!
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