Invited by her crush Sugiyama, Yume attends a practice match for the tennis club where her childhood friend Asahi fills in for an injured player.
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)