"Plugin" is the story of a mechanical city in which every citizen is a part of the city itself, responsible for generating lights by connecting the male and female parts of the mechanism. Everyone seems to fit into this perfect puzzle except the main character, G-O, a man who does not match the rest of his world. G-O finally finds his perfect match – another man – but the City Authority try to stop this uncommon union. It is up to G-O and Ico to show their city that every connection is after all part of the same energy - love.