On a very boring day, Takuya and the gang receive mysterious messages on their cell phones instructing them to rendezvous at Shibuya Station. There, they find a train that takes them unexpectedly into the Digital World. A wild digimon known as Cherubimon is desperate to destroy the Digital World, and it’s up to Takuya and friends to stop him and his minions! Finding the three Great Angel Digimon could be the only way to stop Cherubimon; and so, Takuya sets forth to find them and solve the impending doom that awaits the Digital World.
Throughout his life, Oozora Reiji has always been rather half-hearted. Never able to fully dedicate himself to anything, he lives a sloppy day-to-day existence, until his classmate Yukino introduces him to Dragon Drive -- a virtual reality game. While Reiji garners a passion for the game, it would seem that its founders have other things in mind than simple entertainment. During a special training, Reiji discovers that Dragon Drive is more than just a game, and now must fight for the survival of the dragons as well as all of mankind!
Digimon Season 4: Frontier and Dragon Drive are both about a digital world where you acquire a digital pet that you then use to battle various other creatures and players, allowing the creature to evolve over time. If you liked one the other should be right up your ally.