Digimon Adventure:

The time frame for Tokyo's urban functions coming to a halt was drawing near. Taichi, Agumon and Sora head for a "shrine" written about on a lithograph of the Digital World in search of clues. Meanwhile, Koshiro, who is at another location in the Digital World, continues to gather information along with Tentomon, the Digimon he met there, while keeping in contact with Taichi. During that time, Koshiro and Tentomon get swallowed by a mysterious huge Digimon...