Katie is the founding owner of a popular restaurant named Seconds. Katie inhabits a room in Seconds and is woken up one night by a mysterious, white-haired girl named Lis, who gives Katie a notepad, a single mushroom, and instructions for her to follow to cast a "do-over" spell in order to fix her past mistakes. Katie finds more mushrooms under the floorboard in the restaurant and uses them to fix problems arising with the construction of a brand new restaurant, her relationship with her ex-boyfriend, and to prevent the injury of a waitress named Hazel. Despite Lis' rule of one mushroom per person, Katie ignores Lis' concerns and seeks to use the mushrooms to make her life perfect, but unintentionally creates more problems as a result and disrupts the balance of time and space.
