"Digimon Adventure: Born of Koromon" is a short film that serves as a prologue to the larger "Digimon Adventure" series, providing foundational context for the events that follow. The story begins with a group of children—Taichi Yagami, Yamato Ishida, Sora Takenouchi, Koushiro Izumi, Mimi Tachikawa, Joe Kido, and Takeru Takaishi—attending summer camp when they are suddenly transported to the Digital World. This mysterious realm is inhabited by digital creatures known as Digimon, who coexist with their human partners. Each child is paired with a Digimon, with Taichi forming a bond with Koromon, who later evolves into Agumon.

The narrative centers on the children’s initial confusion and gradual adaptation to their new environment. They encounter various challenges, including hostile Digimon and the overarching threat posed by Devimon, a malevolent entity seeking to disrupt the balance of the Digital World. The children learn that they are the "Chosen Children," destined to protect both the Digital World and their own from impending destruction. Their Digimon partners evolve into more powerful forms through their bonds of friendship and courage, enabling them to confront and overcome early adversaries.

Key themes include teamwork, personal growth, and the importance of trust between humans and Digimon. The film establishes the foundational dynamics between the characters, highlighting their individual strengths and vulnerabilities. Taichi emerges as a natural leader, while Yamato’s protective instincts and Sora’s nurturing nature complement the group’s dynamic. Koushiro’s intellect, Mimi’s optimism, Joe’s cautiousness, and Takeru’s innocence further round out the ensemble, creating a balanced team.

The story sets the stage for the larger narrative of "Digimon Adventure," introducing the concept of Digivolution and the significance of the Digivices, which enable the Digimon to evolve during battles. The film concludes with the group resolving to uncover the mysteries of the Digital World and fulfill their roles as the Chosen Children, laying the groundwork for their ongoing journey.