Kaiju Decode: The Ring of Aidara Teaser, 2027 Debut, Cast

Kaiju Decode: The Ring of Aidara is coming in 2027. On October 18, 2026, Tsuburaya Productions and Toei Animation released the first teaser for the CG anime, along with a third teaser visual. The teaser is also the first chance to hear the two leads.

The Ring of Aidara (Kaiju Decode: Aidara no Yubiwa) is an original story, not a manga adaptation. It follows Maru, a boy who hunts kaiju for a living, and Coco, a girl who wants to live alongside them. Here's the teaser, the visual, the cast and the staff.

Kaiju Decode: The Ring of Aidara at a glance

• Release: 2027

• Original work: Tsuburaya Productions and Toei Animation

• Animation: Arect and Toei Animation

• Director: S/N

• Script: Katsuie Shibata

• Cast: Aya Yamane and Karin Takahashi

When does Kaiju Decode: The Ring of Aidara come out?#

The anime is slated for 2027, according to the official site. There is no exact date yet. The format has not been announced either, so it is not yet clear whether it will be a film, a TV series or a streaming release.

For more shows on the way, see our upcoming anime of 2027.

Kaiju Decode: The Ring of Aidara teaser trailer#

The teaser runs 30 seconds and is on Toei Animation's official YouTube channel. It shows the first anime footage and the first lines from Maru and Coco.

The reveal came on the same day as the 53rd Sakai Festival in Sakai, Osaka, where the story is set. The festival program included a Kaiju Decode talk show with both lead actors and producer Koichi Noguchi.

The third teaser visual#

The new visual shows Coco smiling as she reaches out a hand to Giila, a giant kaiju. The first teaser visual came out in September 2025, and the production was officially announced with its cast in October 2025.

Kaiju Decode: The Ring of Aidara cast#

• Maru: Aya Yamane

• Coco: Karin Takahashi

Maru is a cheerful, mischievous boy who lives peacefully in the City. He makes a living hunting kaiju with Aniki, an older-brother figure. Coco belongs to the Aidara tribe, who hope to coexist with kaiju. She is a kaiju tamer: calm in action, but very curious.

When the cast was announced, Aya Yamane described Maru as honest, kind and driven by a strong sense of justice, someone who helps others without hesitation.

Kaiju Decode: The Ring of Aidara staff#

• Original work: Tsuburaya Productions and Toei Animation

• Director: S/N

• Script: Katsuie Shibata

• Character design (Maru): Sei Nakashima

• Character design (Coco): Masatsugu Saito

• Kaiju design: Masayuki Goto (Tsuburaya Productions)

• Animation production: Arect and Toei Animation

• Production: Toei Animation

According to Anime News Network, Katsuie Shibata wrote Hitchhiker's Guide to the Isekai and Masayuki Goto designed monsters for SSSS.Dynazenon. Masatsugu Saito worked on Cyborg 009: Call of Justice.

What is Kaiju Decode: The Ring of Aidara about?#

In 2070, a supernova sends several space stations crashing to Earth. The disaster becomes known as the Skyfall Calamity. It also brings an unknown bacteria from space, which eats into or merges with matter on Earth and gives rise to new creatures.

Humanity calls the dangerous lands where these creatures live the Zone. People cut themselves off from it and build the City, a society freed from the limits of body, brain, space and time. Maru lives in peace in the City, while Coco is left behind in the Zone. The two stand on opposite sides and search for a way to live together.

What is the Kaiju Decode project?#

Kaiju Decode is a joint project by Tsuburaya Productions, the studio behind Ultraman, and Toei Animation. Its theme is a story about kaiju and girls. A short CG anime and a VR short, Kaiju Decode: First Contact, came out in December 2021. The project also includes a mixed reality game.

You can find the 2021 short on our Kaiju Decode anime page. If you like big monster action, our list of anime similar to Kaiju No. 8 has more to watch.

For official updates, follow the official site and the official X account. You can also track the anime on our Kaiju Decode: The Ring of Aidara anime page.