It's been six months since the links defeated Vaati and Ganondorf as well as deciding that they would be happier remaining as four rather than becoming one again. Since that day Green and Blue have officially joined the ranks of the knights of Hyrule. At the same time Red with Vio's help has opened his own restaurant. While Red handles the cooking and socializing part of it Vio works behind the scenes handling the finances.
However even with the defeat of Ganondorf and Vaati Hyrule had been steadily declining into ruin. It was exactly half a year after the heroes had saved the land that Zelda called them all to the castle. With the help of the six maidens she had located that which was plaguing Hyrule. The whole time Zelda was explaining the situation Vio was gently held a shard of the Dark Mirror that Shadow had put in his pocket.
