A year ago:

Sora, the bearer of the key, had defeated Ansem ... the Heartless seemed to be driven away for the time being ... but what happens afterwards?

Today 1 year later:

Traverse middle:

// It's been a year .. a year .. but King Mickey and this Riku are still missing ... and where is Sora who carries the key? Or Donald the duck? Or goofy? //
Totally lost in thought, Yuffie did not notice that she had run into Aerith and she jerked around to her. "Tell me Yuffie .. are you dreaming again?" said Aerith with a grin. Embarrassed, the addressed girl scratched her head "Oh, I was thinking of Riku, the king and the others again ... I wonder who this Riku is .. Sora said he was perfect!" Aerith had to laugh briefly and gave her an answer "I think you are quite interested in this Riku even though you don't know him huh?" The black-haired one pulled a sulky expression "I don't even know him as I said!" She just kept patting without looking back to Aerith .. .Somewhere completely different ... "Finally there!" The big door to the light called Kingdom Hearts had opened ... A small black mouse with a black cloak stepped out. Next to him was a boy with silver hair and turquoise eyes. But he had his beautiful appearance wrapped in a dark cloak and hood. But suddenly the boy stopped and looked into the void ... // A gray path that leads into the dark. Never again in the dark! Never again! // The little mouse Mickey, also known as King, had also stopped and looked up at Riku. "Is everything okay, my friend?" "I've been thinking ... now everything is okay, don't worry ... so King ..." The mouse quickly interrupted him: "You can call me Mickey, but you know that . "A short nod came from the boy who immediately continued:" Well, Mickey, you should go back to the castle ... I'll look for Sora. "// Kairi is safe ... I know that ... but where could Sora be be? // The mouse looked a bit puzzled at Riku, but agreed to his suggestion.“Be careful!” At this point they parted ways. Riku's expression was serious. His hands clenched into fists, he was standing before the darkness again. The path he was walking was dark, but he took a step forward, full of courage. He had left the dimension of the Kingdom Hearts. Confused, the boy looked around ... more to himself he asked: "W-where am I?" he had stopped again .. everything was a huge meadow that seemed endless .. The boy looked to the right. One way ... Left: also ... and in front of him too! But a voice in him asked: "Which path are you going to take? The right one leads into the darkness .. the left, into the light .." Riku closed his eyes, concentrated and with his charming voice he announced the decision: "Me take the middle way! " he opened his eyes and ran ...

The waves were raging and the beach seemed empty. Destinys Island .. A girl with red hair was walking along the beach like every day, waiting ... what was she waiting for?She sat on the soft sand. // I'll never give up hope .. Sora .. Riku you'll be back one day! //

But Sora was somewhere else .. He was looking with Donald and Goofy ... They were in Wonderland. Sora's desperate shouting hold through the world: "RIKUUU ?!"
Donalds and Goofys were calling: "KING MICKY ??"