Date: July 18, 2013
Platform: Android / Browser / iPad / iPhone
Developer: Square Enix / Success Corp.
Publisher: Square Enix / Disney Interactive
Genre: Action
Theme: Fantasy
Franchises: Disney / Kingdom Hearts
Also known as: Kingdom Hearts Union χ / Kingdom Hearts Union Cross / KINGDOM HEARTS for PC Browser / Kingdom Hearts χ[chi] / Kingdom Hearts: Unchained Key / Kingdom Hearts: Unchained χ
Adaptation: Inspiration

Summary:

Kingdom Hearts χ is set in a world called Daybreak Town, hundreds of years prior to the other games in the series. The game begins before the legendary Keyblade War, a conflict sparked due to disputes between Keyblade wielders over the light that created the world, triggering a calamity that reshaped the world into that seen in the rest of the Kingdom Hearts series. Prior to the war, a precognizant Keyblade Master known only as the Master of Masters bestows a Book of Prophecies to five of his six apprentices, the Foretellers, before disappearing. The book has the ability to manifest objects and people from the future, and contains an account of future events, from which the five Foretellers learn of a prophecy foretelling the world's destruction. To prevent this, the Foretellers use their books to manifest future worlds and defeat the Heartless infesting them to gather pieces of light, called Lux. Each Foreteller creates and leads their own "Union" themed around their individual animal icon: Unicornis, governed by Ira; Anguis, governed by Invi; Leopardus, governed by Gula; Vulpes, governed by Ava; and Ursus, governed by Aced. The player character, a newly awakened Keyblade wielder, chooses to support one of the Unions and works to ensure the chosen faction's supremacy. The future worlds created by the Book of Prophecies include several worlds introduced in previous series entries, including Dwarf Woodlands (based on Snow White and the Seven Dwarfs); Agrabah (Aladdin); Wonderland (Alice in Wonderland); Olympus Coliseum (Hercules); and Beast's Castle (Beauty and the Beast).

Source: https://giantbomb.com/wiki/Games/Kingdom_Hearts_Union_ch_Cross