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Overlord Magolor seizes control of the universe after obtaining the Master Crown. Traveling to the planet serving as the headquarters of the Star Warriors—an organization of Puffball Voids dedicated to protecting the universe from their dark counterparts, Destroyer Voids—Magolor uses the infinite power at his disposal to single-handedly slaughter them all before they threaten his rightful reign.
Unbeknownst to him, one young Puffball named Kirby, afraid of his impending joining of the cosmic knighthood and being separated from his mentor, Meta Knight, escapes the onslaught, having run away beforehand, and while struggling to navigate a sudden asteroid field, instinctively encases himself in a Jamba Heart made of his internal Heart Matter, crash-landing in a large ocean on the planet of Popstar—where the Overlord’s army holds a significant presence.
Thankfully, he goes undetected in his slumber for 100 years, trapped at the bottom of the ocean. He is eventually discovered by accident, however, by the young Sailor Waddle Dee and his adoptive father and captain, Vul, who fish him out and manage to break him free of his crystalline seal and reawaken him.
However, they must now dodge the pursuit of Bandana Waddle Dee, a mysterious child the same age as Kirby, a servant of Magolor scarred and banished to Popstar with his godfather Dedede for his cowardice, who hides his shameful scar with his bandana. Seeking to capture the pending Star Warrior, Kirby, Sailor Dee, Captain Vul, and other allies they make along the way must dodge his pursuit as they travel to all five corners of Popstar so that Kirby can master all Copy Abilities and become a fully-realized Star Warrior, capable of defeating Overlord Magolor before he manages to unseal the dark god Void Termina and ensure the universe remains forever under his control…