Luna is a 6-year-old girl who doesn't want her mother to leave her with the babysitter every time she has to go to work. Her mother, Sara, is a flight attendant and has invented a game to help her daughter cope with her absences: bringing her stones from every place in the world she travels to. Each stone will be a new story to tell. Luna's imagination runs wild every time her mother leaves for distant countries, immersing herself in imaginary worlds unknown to her.