Kingdom hearts 1

When Asuna and her brother in all but blood gets transported to an unknown town, they wield an unknown weapon that is shape like a key, they meet someone just like them by the name of Sora.
Then they meet the king's mage and guard called Donald and Goofy, and they travel to different worlds and meet many people trying to find sora's friends Riku and Kairi.
But they also need to find the king and stop Ansem the seeker of darkness and the evil fairy maleficent from opening the door of darkness.
But will they be able to?