When the King of All Cosmos completes his celestial restoration project and discovers himself at the center of an adoring fan movement, he becomes determined to reward his followers by manifesting their wildest desires. To accomplish this whimsical endeavor, he summons his pint-sized son, the Prince, along with a cadre of equally miniature cousins, tasking them with rolling a mystical adhesive sphere across the landscape to accumulate progressively larger collections of objects. From humble items like writing implements and loose change to massive structures and atmospheric phenomena, these diminutive royal collectors must expand their katamari according to each peculiar wish their grandiose father conjures, transforming the ordinary world into a canvas for increasingly ambitious tributes.