An unusual snow storm hits the town and the Sailor Scouts discover that an evil snow queen Kaguya, wants to freeze the entire earth. It's up to the Inner Sailor Scouts along with the Outers, to defeat the Queen. Meanwhile, Luna falls in love with a human astronomer named Kakeru whose girlfriend is an astronaut about to take a space shuttle mission. Kakeru becomes ill and Luna wishes she could be a human to help him.