Chocobo no Fushigi na Dungeon
チョコボの不思議なダンジョン - Japanese spelling
The story evolves from the opening movie when a fellow chocobo is "turned" evil by a crystal he finds in a garden. When the evil chocobo kicks you into a dungeon, the adventure begins. Travel through an ever changing dungeon, collecting items and weapons to become more powerful, so you can defeat the increasingly difficult enemies.