"Digimon Frontier" is the fourth season of the popular anime series Digimon. Unlike previous seasons, it features human characters who can transform into Digimon themselves, allowing them to fight alongside their digital partners. The story follows a group of children known as the DigiDestined as they explore the Digital World and battle against evil forces. The main characters, including Takuya Kanbara and Koji Minamoto, embark on a quest to save the Digital World from the villainous Lucemon. Throughout their journey, they learn about friendship, teamwork, and the importance of courage while encountering various Digimon species and challenges.