A friend from Mamoru's childhood, Fiore, returns to Earth. He is being controlled by the Kisenian flower and he wants revenge on all the Earth people who left Mamoru lonely. One day we go downtown when this flower youma attack us. We manage to get rid of them but then Fiore shows up. He tries to kill me but accidentally stabs Tuxedo Kamen instead. He takes Tuxedo Kamen and puts him in a healing pod. At the same time a comet is heading towards Earth.
Mercury realizes that the comet is giving off the same energy as the youma so we teleport to the comet. The senshi get attacked by youma but Mars pushes me out of the away. A huge plant comes out of the ground and the senshi are tied to it. Fiore tells me to throw away my rod and he starts the senhi with energy. I throw it away because I don't want to see them hurt, which surprises Fiore. He lets the senshi go but then Kisenian takes control of him again. He is about to kill me but Tuxedo Kamen has gotten free and throws a rose at him. Fiore loses his connection with Kisenian and the comet starts to break up and head towards Earth. I stand up and start to use the silver crystal but Fiore grabs it, trying to start me. He has a vision and realizes that the rose Mamoru gave him was from me. Fiore and the Kisenian flower disappear.
Now I change into Princess Serenity and Tuxedo Kamen changes into Prince Endymion. The other senshi lend me their powers too. The comet flies by Earth and I die from using the silver crystal's energy. Tuxedo Kamen is holding me in his arms when Fiore appears. He gives him a flower with his life energy. Tuxedo Kamen takes some of the nectar from the flower and then kisses me. I wake up and everything is well again.
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