As a Royal Princess, it is Luna's responsibility to watch over the subjects in her kingdom. One of the ways she helps the common pony is to inhabit their nightmares, helping them to overcome their fears and anxieties in order to live stronger the next day. However, one night Luna steps into the dreams of a young filly and finds out that the pony is dying. With nopony else able to help the child, the Royal Princess realizes that she has no other choice but to help. Can Luna save the filly walking the line between life and death?