Usagi has come to the airport to see Mamoru off as he heads to the US to study abroad, but someone shatters Mamoru's body to pieces. In shock, Usagi loses her memory and collapses, but a member of the super idol group the Three Lights is there to catch her. That day, the Three Lights were to star in a music festival. Usagi and friends were planning to perform as well, but a new enemy arrives. Calling themselves "Shadow Galactica," these enemies are Sailor Guardians aiming to steal Sailor Crystals! At the same time, a mysterious young girl named Chibi Chibi and new Sailor Guardians, the Sailor Starlights, also appear, and a battle on an unprecedented scale begins. Sailor Guardians vs. Sailor Guardians! Fittingly the Sailor Moon "final battle" has the future of the galaxy at stake and it starts now!!
Yu Akahane se muda a una habitación compartida después de la transferencia de su padre del trabajo. Ella está emocionada porque va a vivir en la misma residencia de estudiantes con Takumi Shirakawa, también conocido como "Príncipe Blanco". Sin embargo, Haruto Kurosaki, alias "Diablo Negro", la besa como castigo por ir en contra de él. Es el primer beso de Yu Akahane. Desde entonces, ella se vuelve obediente a Haruto Kurosaki.
