Kamen Rider My-Th Explained: Premise, Cast & What to Expect

The Next Kamen Rider Is Here

Kamen Rider My-Th is confirmed to premiere on September 6, 2026 on TV Asahi, taking over the Super Hero Time slot from the currently airing Kamen Rider ZEZTZ. For fans wondering what's coming after ZEZTZ wraps up, My-Th represents a full concept reset, built around East Asian zodiac mythology rather than continuing any of ZEZTZ's dream-based themes.

The Premise: The Twelve Zodiac Alliance

My-Th's story centers on the Zyunishi Doumei, the Twelve Zodiac Alliance, a group that fought monstrous creatures called Fukashigi a century before the show's present day. Both the Alliance and the Fukashigi have awakened again in the modern era, setting up the show's central conflict. The protagonist, Sora Otosumi, inherits a belt tied to the Mouse — specifically chosen because the Mouse holds the first and most mythologically significant position in the East Asian zodiac, according to the show's own framing of the concept.

That zodiac structure gives My-Th an obvious toy-line hook: twelve zodiac positions naturally suggest twelve distinct Rider forms or allied characters, similar to how earlier Kamen Rider seasons have built toy lines around a fixed, countable set of upgrade paths (Geats's Raise Buckles, Gotchard's Chemies, and so on).

Confirmed Cast

Ikuho Akiya plays Sora Otosumi, described as the devoted butler of the Mizuki family, who becomes Kamen Rider My-Th. Riko Horikawa plays Yuna Mizuki, a core supporting character. A second Rider has also been confirmed: Kamuri Minetaka, played by Keisuke Higashi, a stranger who possesses his own Kamen Rider power and becomes Kamen Rider MAOU — continuing the franchise's long tradition, dating back to the original 1971 series, of introducing a second Rider early in a season's run.

What This Means for the Toy Line and Collectors

A zodiac-themed concept with a butler protagonist and a rival second Rider gives My-Th's merchandise line a lot of built-in variety potential — expect belt/buckle-style transformation items keyed to zodiac animals, likely following the pattern of recent Reiwa-era Kamen Rider toy lines where each core item unlocks a specific form. Collectors who followed the Geats Raise Buckle or Gotchard Chemie card lines should expect a similar structure here, just themed around zodiac symbolism instead.

Replacing ZEZTZ: What Changes

My-Th's premiere marks the formal end of ZEZTZ's Super Hero Time run. Where ZEZTZ leaned into dream logic and a more introspective, mystery-driven structure, My-Th's zodiac-versus-Fukashigi setup reads as a return to a more traditional "ancient alliance reawakens to fight ancient evil" structure, which may appeal to fans who found ZEZTZ's central twist divisive.

Frequently Asked Questions

When does Kamen Rider My-Th premiere? Kamen Rider My-Th premieres September 6, 2026 on TV Asahi, replacing Kamen Rider ZEZTZ.

What is Kamen Rider My-Th about? The show follows Sora Otosumi, who inherits a Mouse-zodiac Kamen Rider belt tied to the Zyunishi Doumei (Twelve Zodiac Alliance), which is reawakening a century after first fighting creatures called Fukashigi.

Who plays Kamen Rider My-Th? Ikuho Akiya plays Sora Otosumi, the lead who becomes Kamen Rider My-Th.

Is there a second Rider in Kamen Rider My-Th? Yes — Kamuri Minetaka, played by Keisuke Higashi, becomes Kamen Rider MAOU.