Prologue:
After having defeated the last Zangyack Commander, Bacchus Gill, the hearty space pirates known as the Pirate Squad Gokaiger have once more soared to the vast oceans of the galaxy, searching for more adventures and plundering anything they deem valuable. All while the Space Empire's remnants are once again hunting for their heads and skins. Ah, the thrills of being a wandering fugitive.
The Moon Kingdom, found at the deepest recesses of space, is a pristine paradise in the midst of an otherwise barren and cold planet. It may be a powerful Kingdom due in part to its weapons, said to be able to lay waste to a planet in days, but it always prefers diplomacy to settle conflicts. After being properly married, Usagi Tsukino, formally known as Princess Serenity, and her husband Mamoru Chiba, also known as Prince Endymion of the Earth Kingdom, have decided to live there to raise their child. Usagi's friends have decided to stay on Earth and live their normal lives, except Minako Aino, who decided to be by her side. Mamoru's Four Generals have also joined him, as part of their eternal vow to protect him.
The home world of the once-"glorious" Zangyack Space Empire has once again fallen into anarchy and schisms between various factions have escalated into direct confrontations that only succeeded in killing thousands of useless lives. These factions are claiming that they are the rightful heirs to the Imperial throne, and some of them have gone as far as denouncing their Emperor Ackdos Gill as a heretic, a sham, an incompetent leader, and that his son Prince Warz was nothing but a spoiled brat and "a child's soul in an adult's body". And despite this chaos, this planet has some undiscovered secrets that can bring the whole universe in jeopardy once it has revealed itself.
All these three factions will eventually meet in another universal conflict that will ultimately determine their futures once and for all!