Although the popularity of the idol group Three Lights is off the charts, Usagi hasn't realized that Seiya, Yaten and Taiki are the Sailor Starlights. But with the number of Phage growing in the city, the purpose of star seeds is the biggest mystery that needs to be solved. Could the mysterious Chibi-Chibi hold the answer? The tide is turning, but not in Usagi's favor. Her allies are being overpowered, and altered timelines are confusing the fate she knows to be true: Mamoru is her true love, Neo Crystal Tokyo is her future kingdom and her fellow Guardians will be her eternal protectors... right? The ultimate battle with the chaotic Sailor Galaxia lies ahead, and the fate of all existence lies in the balance.