Hinata Yume is an optimistic and energetic 1st-year middle school student.
Yume picks up a mysterious stuffed toy which has fallen from the sky the day before the entrance ceremony.
The stuffed toy calls itself "Myu", and begins to talk. Also, when Myu connects hearts with its partner, both of them can enter the same dream with the ability called "Yume Syncro."
That night, the queen of the Miracle Dreamy Kingdom above the sky in a dream appears and tells Yume this:
"If you collect the Dreamy Stones together with Myu, I will grant you a wish".