Nightmare Moon is the name of the evil mare who tried to cast eternal night over all of Equestria. However, the Six Elements of Harmony stopped her, turning Nightmare Moon back to her real self; The young Princess Luna. Luna apologized to her big sister, Princess Celestia, for doing what she had done. Her sister forgave her, but still she feels that something is wrong.
Soon Luna gets stressed out while thinking about what she had done. As the shy young pony she is, her mind is diseased with stress of doing the wrong thing. She doesn't know if she is taking her thoughts too far, or if it's true.
The day Luna returned home, Luna goes to sleep at midnight with stress filling her mind. She glances out the window to find a big white building far away in the plains. She decides to go explore the strange building, and find out something that could impress her big sister, and make her proud. But does she know of the tests she shall face?
On this adventure, Luna may overcome her problems, and maybe meet a few loyal friends along the way...

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This is my first story! I really hope you like it! The cover picture belongs to... http://pterosaurpony.deviantart.com/

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EDIT: Changed main characters.