Ruli and Kiyoshiro Higashimitarai come to the Digimon assembly to inquire about the recent increase of Digimon in the human world. Apparently, Digimon are being led to a gate into the human world by a voice, but the humans are unable to find any leads. During this, Ruli and co hear about a "strange fog" that has popped up in recent rumors. People who supposedly disappeared en masse are found standing dazedly in the mist, and this rumor spreads not only among the Digimon but as an urban legend among humans. Meanwhile, Hiro goes on a fishing trip with Gammamon and his friends. As they board the boat that picks them up, the area grows enveloped by fog and...?!