Curiosity is part of any 10-year-old's life, but Sakura just broke the seal on a magical book and released all of the mischievous spirits imprisoned on the cards inside! Kero, the 'Guardian of the Clow Cards' is horrified to find all of the cards gone and tells Sakura she must become the 'Cardcaptor' and retrieve the spirits before they work their mischief in the world.