Monster Slayers: The Champions of the Elements

From the publisher's web site:

Monster Slayers: The Champions of the Elements captures the flavor of the Dungeons & Dragons tabletop roleplaying game in one fast-paced, action-packed package for kids who want to learn the fundamentals of the game. It’s also a fun diversion for experienced players who need their D&D fix, but don’t have the time for a full-length game.

The Champions of the Elements requires no previous knowledge of Dungeons & Dragons, and all you need to play is included in this adventure, aside from a few dice, pencils, and some future roleplayers to play it with.