木之本樱，是擅长体育的小学4年级学生。某天，小樱从学校回家，在平常都没有人的地下书房发现似乎有什么人的样子。小樱走下去一看，那里有一本闪耀着金色光芒的书。里面装有牌，然而，在读写在上面的文字的时候，刮来了剧烈的风，牌四处飞散开去。从书的最后，出现了名为可鲁贝洛斯的奇妙生物，书中写着“库洛牌的封印被解开之时，灾难就会降临世间”之类的话。随后，可鲁贝洛斯将封印的钥匙交给了小樱，令她成为收复牌的魔卡捕获者。当晚，小樱用魔法与实体化的魔卡对决……

内容跟随第一部原作漫画的结局，描述国小毕业后小狼回香港到小狼决定回日本与小樱一起上初中之间两人的感情故事。

Sakura had managed to capture all of the Clow Cards which could bring disaster to the world and turned them into her own Sakura Cards. Now it’s spring. With cherry trees in full blossom, Sakura is just entering middle school. Her beloved Syaoran has returned from Hong Kong, and Sakura was thrilled to be going to school with him again. But one night, something strange happens to her Cards...