The official Japanese e-Store for Square Enix is now selling a box of Kingdom Hearts themed key rings based upon the medals found in Kingdom Hearts Unchained χ[chi]! The set features KH II Mickey, KH1 Cloud, Donald, Shadow, Axel, Roxas, DDD Sora, and KH1 Riku. Currently, the collection is priced at $51, £40, or €47 euros.

The collection will be available April 29th in Japan. There is no confirmation of this box set being available anywhere else. The medals can be seen below, and can be purchased from here.

UPDATE 1: The Kingdom Hearts Unchained χ[chi] medal key ring box is now in stock at the Square Enix Café in Tokyo! View images of it, provided by the official Square Enix Café Twitter account, below:

UPDATE 2: View a photo of all of the key rings from the Kingdom Hearts Unchained χ[chi] medal key ring box laid out, thanks to @ArikaMiz on Twitter, below:

UPDATE 3: CaféReo has revealed a new box of key ring medals from Kingdom Hearts Union χ[Cross]. These medals include KH1 Sora, Meow Wow, Ventus, Naminé, Xion, Axel and Roxas, Winnie the Pooh, and KH 0.2 Mickey. The box set will cost 5,600 yen ($49.79 USD) and each medal will be 700 yen ($6.22 USD). The key rings will be available in November 2017. You can view the medals below:

Thanks to @aibo _ac7 and KHInsider for the tip!

UPDATE 4: The new box of key rings medals from Kingdom Hearts Union χ[cross] is now available to pre-order on AmiAmi! You can pre-order the box set here. Their list price is 6,040 ($53.76 USD), and their AmiAmi 15% off price is 5,120 yen ($45.57 USD).

UPDATE 5: The new box of key rings medals from Kingdom Hearts Union χ[cross] is now available to pre-order on the Square Enix Japan Store. Their list price is 6,040 yen ($53.71 USD) and are set to release on November 17th, 2017. You can pre-order the box set here.