Digimon Adventure is a retelling of the 1999 TV anime. The game starts from the beginning of the first episode. On August 7th, 1999, seven kids went to a summer camp. Everything was normal until it started to snow in the middle of summer! Soon after that, an unusual phenomenon happened in Japan: an Aurora in the sky! These don't usually occur in Japan, so while the kids were watching the aurora, suddenly some meteorite-like things fell from the sky, looking like virtual pet toys.
Right after that, a huge water wave sucked the kids into it and transported them to the Digital World. There, they met creatures called Digimon.
The gameplay has typical Digimon-style battling between three Digimon on each side, with exploration and RPG elements as part of the game, including subquests.