ゲーム Final Fantasy III

In a remote village of Ur, four orphan boys were raised by the priest Topapa. Once, the Crystal of Wind, guarded by the people of Ur, sank deep into the earth. The four boys decided to retrieve it from there and went down into an underground cave. But when they found the crystal, it spoke to them and from its words they understood they were chosen for a much more important and world-embracing mission...