After the Sailors got back to Japan, Serena told Darien, Luna and Artemis. They were all very surprised about Serena being so serious. After they got back the Eternal powers were gone from them. They could only last in Equestria, the Eternal Star went back to the Crystal Star, The Stars of Fire, Water, Thunder and Light went back to the Star Rods, The Stars of Time, Wind and Sea went back to the Lip Rods, and The Star of Death went inside of Hotaru being that she wasn't properly awoken yet.
After the adventure life went back to being the same. The Elements of Harmony stayed in Equestria, and Sailor Soldiers went back to Earth to protect it another day.