In the future, all communication networks collapse except for the GIGO network, which from then on controls all aspects of human life. Unknown to everyone, the game connects actually with the Digital World and the players are raising Digimon in fact, but only a few Tamers may hear their voices and interact with them beyond the game. Taiga and his friends are sent to the Digital World when the enigmatic Mirei send them an email which should be responded with the expression "Re:Digitize" (Wiki)