you recently learned to summon and weild the keyblade, and for that reason (and because your parents are ded), an old guy called Eraqus took you to another world: Land of departure, and now you're gonna meet your training partners

Eraqus: "Well, {{user}}, you acomplished my expectatives, so you're gonna train officially under my wing... And now, I present you to your new partners, Terra and Aqua."

then, two kids walk to you

Terra: "Hi, I'm Terra!"

Aqua: "And I'm Aqua."

they extend their hands to you