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A Yo-kai Keystone (Japanese: 妖怪アーク Yōkai Āku) is a small, key-shaped item used to summon Yo-kai from the Yo-kai Watch Elda. They first debuted in M04 and the Shadowside anime, and would later appear in Yo-kai Watch 4 and Yo-kai Watch!.

They are said to be the successor of Yo-kai Medals, with some of them featuring Lightside and Shadowside Yo-kai on both sides, while several Yo-kai either have nothing at the back or a Onechanside. Rare variants with different colors also exist.

Just like with Medals, Yo-kai Keystones have been made into real life collectable merchandise. The levels of rarity that range from common, to extremely rare, are Normal, Rare, Extreme Rare, Super Extreme Rare, and Ultimate Rare.[1] Most of the Normal Keystones have a clear color and a regular holo foil, while Rare Keystones have a clear color and a glittering holo foil, and Extreme Rare Keystones have the colors of their tribes, as well as glittering holo foil. There are also Shining Keystones that are equal to Super Extreme Rare ones, and Gold Keystones that are equal to Extreme Rare ones.

There are 330 Keystones in total.

Overview

Yo-kai Watch Shadowside Oni-o no Fukkatsu

Natsume holding Yo-kai Keystones.

Yo-kai Keystones represent the feelings that connect Yo-kai and humans. Just like Yo-kai Medals, they are given to select people once they fulfill a specific Yo-kai's needs.

Yo-kai can be summoned via the Yo-kai Watch Elder by putting the Keystone into the keyhole, and saying the summoning chant while the Yo-kai appears in sight.

It was originally thought that the Keystones were successors to the medals, but due to their inclusion in Forever Friends and Yo-kai Watch!, they existed in the past and present as well. However, in Yo-kai Watch 4, Nate's Yo-kai Medals turn into Keystones after he visits the future world, probably due to the effects from the future.

Types of Keystones

PoofessorArtwork
The title of this article is conjectural and has no official name.

For consistency, a fanmade name will be used.


Shadowside Keystones

Shadowside Keystones are ones that apply to Lightside and Shadowside Yo-kai, with both of the sides representing the Lightside and Shadowside form. They appear regularly throughout Yo-kai Watch Shadowside, and in the future world of Yo-kai Watch 4.

Merchandise-wise, several Keystones have different variants of existing Yo-kai, such as Junior's Shadowside form taking the form of Blizzard Wolf rather than Burning Dragon, and Nekomata's Shadowside Gold Keystone being of an unidentified entity.

Godside Keystones

Godside Keystones function just like Shadowside ones, except they have a third form which is considered to be stronger than their Shadowside. They were first featured in M05, where Yo-kai like Nekomata, Zashiki-warashi, and Kappa are given forms after they were summoned with the Yo-kai Watch Elda God.

A few of those Keystones appeared in two of the Yo-kai Keystone Zero series sets, which are colored white instead of light-blue. Though, Yo-kai like Yamambaa and Suu-san have differently-shaped Keystones.

Onechanside Keystones

Onechanside Keystones are used for regular Yo-kai that have appeared in the original games and anime, and serve as a replacement for Yo-kai Medals. They are used prominently in the Yo-kai Watch! series, where Nate uses them to summon them in the same vein as he usually does.

Regular Keystones at the back have a background, with the silhouette of the Yo-kai present. While several Yo-kai now has a "Onechanside", which allows it to take on a different form that could drastically change any outcome.

Merchandise

Main article: List of Yo-kai Keystone Sets (Japanese)

Yo-kai Keystones exist in real life as collectable merchandise, sold in Japan. They are manufactured by Bandai Japan, which have been responsible for manufacturing Yo-kai Medals and other related items. They are released in sets, featuring select Yo-kai. Each box contains 10 random Keystones, making this a blind box, much like with the Yo-kai Medals before.

Each pack comes with one Keystone, which can be used to play the summoning song on the DX Yo-kai Watch Elder toy, or scanned via the Nintendo Switch's NFC reader in the Yo-kai Watch games. Depending on the Keystone, it usually gives the player several items, or special Key Items which allow the player to fight exclusive Yo-kai.

There are several separate Keystone packs, that sometimes feature Goku Yo-kai like Rinne and Goku Fubuki-hime together, with the former having a unique Keystone design that stand out from the regularly released sets.

For Yo-kai Keystones to be scanned into the PlayStation 4 version of Yo-kai Watch 4++, an application is required to download it as the console doesn't have a NFC chip reader.

List of Yo-kai Keystones

Keystone Sets

Packaging Box Overview Keystone No.
Yo-kai Ark 1st - Hiragame! First Door Yo-kai Ark 1st - Hiragame! First Door Box Yo-kai Keystone 1st - Open! First Door 13 (+1 Gold) different Yo-kai Keystones to collect.


  • 4 Extreme Rare (1 Gold)
  • 4 Rare
  • 6 Normal
Release date: July 14, 2018 (Japan)
Compatible with Ver. 1 and up with the Yo-kai Watch Elder toy.
Yo-kaiArk2nd DebutOfTheShiningArks Yo-kai Ark 2nd (Box) Yo-kai Keystone 2nd - Shine! Debut of the Shining Yo-kai Keystones!! 14 (+1 Secret) different Yo-kai Keystones to collect.


  • 2 Super Extreme Rare (2 Shining)
  • 3 Extreme Rare (1 Gold)
  • 5 Rare
  • 5 Normal
Release date: September 15, 2018 (Japan)
Compatible with Ver. 1 and up with the Yo-kai Watch Elder toy.
Yo-kai Ark 3rd - Obtain them! Legendary Yo-kai! Packet Yo-kai Ark 3rd - BOX Yo-kai Keystone 3rd - Obtain them! Legendary Yo-kai! 14 (+2 Secret) different Yo-kai Keystones to collect.


  • 2 Super Extreme Rare (1 Legendary, 1 Stray)
  • 4 Extreme Rare (1 Gold)
  • 3 Rare
  • 7 Normal
Release date: November 17, 2018 (Japan)
Compatible with Ver. 1 and up with the Yo-kai Watch Elder toy.
Yo-kai Ark Zero Packet Yo-kai Ark Zero Box Yo-kai Keystone Zero - The Other Side of the Silver Screen 14 (+1 Secret) different Yo-kai Keystones to collect.


  • 3 Ultimate Rare
  • 6 Extreme Rare (1 Stray, 1 Kuroi, 1 Miracle/Lucky)
  • 3 Rare (1 Stray)
  • 3 Normal
Release date: December 8, 2018 (Japan)
Compatible with Ver. 2 and up with the Yo-kai Watch Elder toy.
ArkSeries4Packet ArkSeries4Box Yo-kai Keystone 4th - Door to the Unknown 15 (+2 Secret) different Yo-kai Keystones to collect.


  • 2 Super Extreme Rare (Legendary)
  • 6 Extreme Rare (1 Stray, 1 Miracle/Crystal)
  • 3 Rare
  • 6 Normal
Release date: January 19, 2019 (Japan)
Compatible with Ver. 2 and up with the Yo-kai Watch Elder toy.
ZeroSunMoonGodPacket ZeroSunMoonGodBox Yo-kai Keystone Zero - Sun and Moon God 12 different Yo-kai Keystones to collect.


  • 2 Ultimate Rare
  • 3 Super Extreme Rare (2 Shining)
  • 7 Extreme Rare (4 Gold, 1 Kuroi)
Release date: January 19, 2019 (Japan, World Hobby Fair Spring '19)
Compatible with Ver. 2 and up with the Yo-kai Watch Elder toy.
YKA5Pak YKA5BOX Yo-kai Keystone 5th - Strongest Yo-kai Appear!! 15 (+2 Secret) different Yo-kai Keystones to collect.


  • 3 Super Extreme Rare (1 Legendary, 2 Shining)
  • 5 Extreme Rare (1 Stray, 1 Miracle/Crystal)
  • 3 Rare
  • 6 Normal
Release date: February 23, 2019 (Japan)
Compatible with Ver. 2 and up with the Yo-kai Watch Elder toy.
Yo-kaiArksK1 YKAK1 (Box) Yo-kai Keystone K1 - A Wobble Miracle! 20 (+1 Secret) different Yo-kai Keystones to collect.


  • 1 Super Extreme Rare (Shining)
  • 7 Extreme Rare (1 Crystal, 3 Miracle, 1 Stray)
  • 5 Rare
  • 8 Normal
Release date: March 30, 2019 (Japan)
Compatible with Ver. 3 and up with the Yo-kai Watch Elder toy.
YAK2Packet YKAK2BOX Yo-kai Keystone K2 - Goku Yo-kai War! 20 (+2 Secret) different Yo-kai Keystones to collect.


  • 2 Super Extreme Rare (Shining)
  • 7 Extreme Rare (1 Goku, 3 Miracle, 1 Stray)
  • 7 Rare
  • 6 Normal
Release date: May 25, 2019 (Japan)
Compatible with Ver. 3 and up with the Yo-kai Watch Elder toy.
Yo-kai Ark K3 Packet YKAK3Box Yo-kai Keystone K3 - Shadowside Yo-kai Again! 20 (+3 Secret) different Yo-kai Keystones to collect.


  • 3 Super Extreme Rare (2 Shadow, 1 Miracle Shining)
  • 7 Extreme Rare (2 Shadow, 1 Stray, 2 Miracle)
  • 8 Rare
  • 5 Normal
Release date: June 29, 2019 (Japan)
Compatible with Ver. 3 and up with the Yo-kai Watch Elder toy.
Yo-kai Ark Series 2 Series 02 - Yo-kai Arc K SP ~ Extreme! Shadowside! ~ Pack YKAKSP Box Yo-kai Keystone K-SP ~ Extreme! Shadowside! ~ 10 (+2 Secret) different Yo-kai Keystones to collect.


  • 1 Super Extreme Rare (Shining)
  • 9 Extreme Rare (1 Miracle)
  • 1 Rare
  • 1 Normal
Release date: June 29, 2019 (Japan, World Hobby Fair Summer '19)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
YKAK4 Packet YKAK4 Box Yo-kai Keystone K4 - Many Treasures! Collected and Treasured Yo-kai! 20 (+2 Secret) different Yo-kai Keystones to collect.


  • 3 Super Extreme Rare (1 Miracle, 2 Jewel)
  • 5 Extreme Rare (1 Miracle, 1 Jewel, 1 Stray)
  • 10 Rare
  • 5 Normal
Release date: July 27, 2019 (Japan)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
YKAK5Pak. YAK5 Box Yo-kai Keystone K5 - Challenge! The Conclusion of the Seven Valuable Jewel Generals! 20 (+1 Secret) different Yo-kai Keystones to collect.


  • 4 Super Extreme Rare (1 Legendary, 1 Miracle, 1 Stray, 1 Jewel)
  • 2 Extreme Rare (1 Miracle, 1 Jewel)
  • 9 Rare
  • 6 Normal
Release date: September 14, 2019 (Japan)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
YokaiArkK6Pack YokaiArkK6Box Yo-kai Keystone K6 - Save me! Endangered Yo-kai 20 (+2 Secret) different Yo-kai Keystones to collect.


  • 3 Super Extreme Rare (Shining)
  • 6 Extreme Rare (3 Extreme Rare, 1 Miracle, 1 Stray)
  • 10 Rare
  • 3 Normal
Release date: October 12, 2019 (Japan)
Compatible with Ver. 5 and up with the Yo-kai Watch Elder toy.
YokaiArkK7Pack YokaiArkK7Box Yo-kai Keystone K7 - Advent! The Great King of the Yo-kai World 22 (+2 Secret) different Yo-kai Keystones to collect.


  • 4 Super Extreme Rare (2 Shining, 2 Legendary)
  • 9 Extreme Rare (8 Extreme Rare, 1 Miracle)
  • 5 Rare
  • 6 Normal
Release date: November 23, 2019 (Japan)
Compatible with Ver. 5 and up with the Yo-kai Watch Elder toy.
YokaiArkSPPack YokaiArkSPBox Yo-kai Keystone-SP ~ Shadowside Ultimate Selection ~ 23 (+2 Secret) different Yo-kai Keystones to collect.


  • 5 Super Extreme Rare (2 Shining, 2 Legendary, 1 Gemnyan)
Release date: December 7, 2019 (Japan)
Compatible with Ver. 5 and up with the Yo-kai Watch Elder toy.

Mini Packs

Keystones Box Overview Keystone No.
YKAS1Arks YKAS1Box Yo-kai Keystone Series 01 - Yo-kai World's 1st Martial Art Tournament - Goku Orochi Comes with two different Yo-kai Keystones.


  • 1 Ultimate Rare
  • 1 Super Extreme Rare
Release date: May 18, 2019 (Japan)
Compatible with Ver. 3 and up with the Yo-kai Watch Elder toy.
YKAKS2Arks YKAS02 Box Yo-kai Keystone Series 02 - Yo-kai World's 1st Martial Art Tournament - Rinne Comes with two different Yo-kai Keystones.


  • 1 Ultimate Rare
  • 1 Super Extreme Rare
Release date: July 13, 2019 (Japan)
Compatible with Ver. 3 and up with the Yo-kai Watch Elder toy.
Jewel Yo-kai Ark Holder YKASEXBox Yo-kai Keystone Series EX - Seven Jewel Generals SP Comes with two different Yo-kai Keystones.


  • 2 Ultimate Rare
  • 1 Super Extreme Rare
Release date: August 3, 2019 (Japan)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
BlaDiaArk (N) YKAKDBox Yo-kai Keystone Series EX - Seven Jewel Generals - Black Dianyan Comes with 1 Ultimate Rare Keystone.
Release date: September 14, 2019 (Japan)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
RubShuArk (N) YKARSBox Yo-kai Keystone Series EX - Seven Jewel Generals - Ruby Shurakoma Comes with 1 Ultimate Rare Keystone.
Release date: September 14, 2019 (Japan)
Compatible with Ver. 4 and up with the Yo-kai Watch Elder toy.
YArkS4Enma (O)
YArkS4Zazel (N)
YArkS4Box Yo-kai Keystone Series 04 - Yo-kai World's 1st Martial Art Tournament - Lord Enma Comes with two different Yo-kai Keystones.


  • 1 Ultimate Rare
  • 1 Extreme Rare
Release date: November 23, 2019 (Japan)
Compatible with Ver. 5 and up with the Yo-kai Watch Elder toy.
YArkSSPKenAma (G)
YArkSSPGesTsu (G)
YArkSSPBox Yo-kai Keystone Series 05 - Kenshin Amaterasu and Gesshin Tsukuyomi Comes with two different Yo-kai Keystones.


  • 2 Ultimate Rare
Release date: December 7, 2019 (Japan)
Compatible with Ver. 5 and up with the Yo-kai Watch Elder toy.

Trivia

EarlyJibanyanArc

Jibanyan's Keystone with the Charming heart insignia, as seen in M04.

In other languages

Language Name Meaning
Flag of Japan Japanese 妖怪アーク Yōkai Āku
Flag of France French Sésames

External links

References

  1. https://toy.bandai.co.jp/series/youkai/item/detail/5627/
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