Emma is a French student at Ark College, a coastal city in northern China.
During an outing, he accidentally rescued a cow cat and adopted it, naming it Wang Dali.
Wang Dali is actually a time traveler from the Magic Sister, who is possessed by the cow cat for various reasons.
Wang Dali relies on Emma's careful care every day and gradually regains his magic power. And help Emma reach the top of her life through magic...
