Betray: v. to disappoint the hopes or expectations of.

Luna is girl, or what they would call a "monster", who no one cares about. Until one day, she met someone who is willing to care and love for her. She fell in love, fell too deep that she finally lost everything. 

Luna is...

A girl.

An unique girl.

A threat.

A freak.

A monster with a lonely and broken heart...