This is for anyone who is unfamiliar on how Chi, the browser version of the game, ended. Unchained Chi starts right before the cutscene I'm about to link. If you've played everything in Unchained/Union Cross up to the latest story update, you should be well ready!
So, the recent story update introduces Ven to the global players, and also informs the players that the keyblade war has already happened, with only the union members still remembering the events. These are the events, if you wish to watch and understand the whole story of chi.
Forgive the overvoicing.
If the video doesn't already start where I linked, skip to 1:06:35