Ok the Sailor Moon S Movie is my favorite Sailor Moon movie for the fact that it is based off the manga, and that it has Luna turning into a human for the first and only time. Not only that, but you gotta love the supporting Characters named Kakeru and Himeko too, as it focuses more on them and Luna than in the other one.
Ok it starts off when a snow witch by the name of Kaguya (not to be confused with the Moon Goddess Kaguya or something), takes over Earth and tries to freeze everyone and it's place. Meanwhile, Usagi and her friends after spending a lot of time studying and getting to know the Outer scouts more, decides to spend winter break by hanging all over rural Japan and go shop around and cruise.
Meanwhile Luna meets a young guy by the name of Kakeru,a young scientist, who dreams of going up to the moon and meeting his Moon Princess by the name of Kaguya, in which the famous Kaguya story is based off of. Anyways a love triangle forms between Luna and Kakeru and Himeko, especially when Artemis starts showing his strong feelings towards Luna.
It's a great film which will really have you in tears and will have you consider this to be the greatest film that's ever made. It sure has with me. This is my favorite out of all of them, especially considering the fact that it's based off the manga, which i find really greaT. i Love Sailor Moon, and i totally recommend anyone watching it! It's a classic!