Sailor Pluto reveals that she was revived by Neo Queen Serenity and returned from the future by her request. Uranus, Neptune and Pluto explain their mission to Usagi, who transforms into Princess Serenity. Mugen Academy is closed by order of the authorities who hold Professor Tomoe responsible for the disappearances that occurred there. To further investigate the professor’s involvement with the Death Busters, Luna convinces Chibiusa to act as a spy for them, thanks to her friendship with Hotaru. Chibiusa visits Hotaru’s home to check on her, and discovers that Hotaru has some bio-mechanic parts implanted on her body and flees in fear. Soon after, a hailstorm begins, draining the Hostes of those it touches and turning them hostile. Meanwhile, Cyprine, the last of the Witches 5, attacks Haruka who transforms into Sailor Uranus to defend herself, soon after joined by the other Sailor Guardians as well. However, Cyprine uses her power to mind control the Guardians, except for Usagi, and turn them against each other. When Usagi attacks Cyprine to help her friends, Cyprine’s other half, Ptilol, appears. Mamoru and Chibiusa then arrive, and by Usagi’s request, the three combine their powers together, summoning the Legendary Holy Grail.