Kamen Rider MY-TH: The Chaotic Zodiac (仮面ライダーマイス 十二支十色) is a TTFC-exclusive miniseries spin-off serving as supplementary material to Kamen Rider MY-TH.

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?! …