Which game features the three keyblade wielders Ventus, Terra, and Aqua?

The game featuring the three Keyblade wielders Ventus, Terra, and Aqua is Kingdom Hearts: Birth by Sleep. This action role-playing game serves as a prequel to the original Kingdom Hearts.

Set roughly ten years before Sora's first adventure, Birth by Sleep follows the three apprentices as they search for the missing Master Xehanort and investigate the appearance of the Unversed. Each character has a separate campaign, and the three stories overlap while showing the same crisis from different perspectives. Their teacher, Master Eraqus, trains them at the Land of Departure.

The trio's journeys gradually pull them toward the Keyblade Graveyard, where Xehanort and Vanitas attempt to create the χ-blade and trigger a new Keyblade War. The game was released for the PlayStation Portable in 2010. Players sometimes confuse it with Kingdom Hearts II, because Ventus, Terra, and Aqua first appeared in that game's secret ending, but Birth by Sleep is the title centered on all three.