An unnatural blizzard buries Tokyo as Princess Snow Kaguya, an alien entity bent on freezing the Earth, hunts for the last fragment of her comet. Usagi Tsukino and the Sailor Guardians move to stop her, while the cat Luna quietly falls for Kakeru Ohzora, a young astronomer whose astronaut girlfriend Himeko Nayotake is about to leave on a space mission. This second Sailor Moon S film tells an original story set apart from the TV series, built around Luna's one chance to reach Kakeru as something more than a cat.