It starts with a kid named Dai remembering a story told to him by his grandfather, the monster magician Brass, about the defeat of the Demon Lord Hadlar by the hands of a hero who, as the story progresses, is known to be Avan.
Unfortunately the movie Dragon Quest: The Great Adventure of Dai is not yet available on HBO Max.
| Editing | Shigeru Nishiyama | Editor |
| Production | Riku Sanjou | Producer |
| Production | Kōji Inada | Producer |
| Directing | Keiji Gotoh | Director |
| Production | Chiaki Imada | Executive Producer |
| Writing | Riku Sanjou | Comic Book |
| Writing | Katsuyuki Sumisawa | Writer |
