The Digimon Movie
This movie takes place in Highton view terrace, four years before the chosen children went to the Digital world. It was told from Taichi's point of view (In the English version, it is told from Hikari's point of view). One night Taichi wakes up to go to the bathroom and notices Hikari staring at the computer screen. On the computer screen, there is a Digi-egg. The Digi-egg suddenly came out from the screen. (The movie shows Taichi cooking but he was so young then) Hikari takes care of the Digi-egg which hatches into a Botamon. It digivolves into Koromon very soon. After playing and feeding Koromon, that night he starts shaking and digivolves into Agumon (Not the same Agumon Taichi have). This Agumon however, is huge and bigger than Taichi's Agumon. It breaks through the bunk bed! Hikari climbs on his back and they jump out the window. Taichi quickly chase after them.
A warp appears in the sky and another Digimon comes down, Parrotmon. Agumon digivolves into Greymon and battle Parrotmon! The other chosen children are shown watching the fight from their apartment. Greymon is able to defeat Parrotmon, but he disappears together with Parrotmon. Hikari wanders around looking for her lost friend calling his name "Koromon!"