Luna appears in the first episode of Sailor Moon,When Usagi saves her from a group of boys who are harassing her. After Usagi saves her Usagi pulls off the bandaid covering Lunas Cresent moon on her forehead. Luna suspects that Usagi could be sailor moon,but is not sure. Luna goes to Usagi's room where she finds her and tells her that she is sailor moon

The first time Luna falls in love is in Sailor Moon S the movei. She falls in love with a scientist named Kakeru.He jumped in front of a car and saved her form being run over when a fever made her too weak to keep going. He cared for her through the night until she was well. While he didn't love her, but an astronaught named Himeko. He believes in a Princess Kaguya that lives on the moon.

This movie was also the first time that Luna changed into a human. She wanted so badly to be his princess Kaguya and show him the view of the Earth from the moon,which was something that he really wanted to see. When Luna got over him she realized how much Artimus loved her and she him