After Tokiwa’s twin brothers Kanta and Kenta arrive home and meet her friends, Tokiwa explains that Kanta hasn`t been his cheerful self lately.
The story begins when a middle school girl named Yume sees something fall from the sky, and meets a pale violet-colored kitten named Mew. It turns out that Mew has the power of "Yume Synchro" (Dream Synchro), the power to enter dreams. In the dream world, the girl and Mew collect Dream Stones. (Source: ANN)