The Foretellers (Extracted) - Kingdom Hearts χ Back Cover

Extracted from the latest Union Cross Event quests related to the Keyblade War released today in the Japanese version. Those quests are being released in the global version as well, and will be uploaded here as soon as they are available (they're supposedly going to release them fully throughout September as part of the 4th Anniversary event).
So what they're basically doing is turning the final events of the PC Browser version into quests, as flashbacks, leading to the Keyblade War.