I made this motif initially to a concept song I would use in the opening CG of the game, since the main characheter would call Luna, I decided to call this Luna Motif and use it wherever the music resembles to her.

Then I came up with the base,using the chord progression of I, III and VII on the tone of A. All the rest I filled up with improvisation based on this first part. The result you can check below.

After the first version, I created a new one using a Grand Piano, I also added some more bass notes to try to pass some more feelings.