An enigmatic flâneur named Gaustine opens a 'clinic for the past' that offers a promising treatment for Alzheimer's sufferers: each floor reproduces a decade in minute detail, transporting patients back in time. But as the rooms become more convincing, an increasing number of healthy people seek out the clinic as a 'time shelter', hoping to escape from the horrors of our present - a development that results in an unexpected conundrum when the past begins to invade the present.