In a future where time machines are commonplace, Rex buys a machine on credit and defers the installments to the past. 20 years earlier, he starts receiving invoices for a machine that does not yet exist. Rex ignores the invoices and uses them to practice origami, an art he recently became fond of. Charges for late payments continue to arrive, which Rex ignores, assuming they are scams. He ends up losing his house and job due to repossessions sent from the future. Rex ends up homeless and 10 years later finds out about the invention of time travel in a shelter where he lives among other beggars as they talk about similar invoices and charges to those received by Rex long time ago. Thanks to the conversation, Rex remembers his first origami folds and spends the next 10 years retracing back his steps to that first invoice. The search leads him to his former home, which has been demolished to build a luxurious shopping mall. Once inside, a vendor offers Rex a time machine and the possibility of paying it on credit. Although keeping the brochure, Rex rejects the offer. He spends the night in a park practicing origami until he reconstructs the first opening folds he used when he started that art. Nostalgia takes over as he starts to yearn for a time machine.