Kari has begun to get sick. Desperate to help her, Tai tries to find a cure. Kabuterimon discovers a gigantic city that has combined all of the Real World's most famous cities. With Izzy's help, Tai tries to find medicine for Kari in the city, but they find out that it's all actually Machinedramon's headquarters. As they try to dodge Machinedramon's forces, a secret about Tai's past is revealed.
—Chris Green