Fairytail: Because of a shadow (NaLu)

A familiar, yet evil shadow. It lurks on the blonde haired mage, Lucy Heartfillia. Why? Jealousy? Jealous of what? Angry? Angry for what? How does this shadow, one that was trusted and was known by everyone, affect Lucy? Natsu is able to realize his feelings for Lucy because of the reason this Shadow has to kill Lucy.

Will that reason urge him?

Or will that reason want Lucy as well?

Join this thrilling romantic action adventure. Two lovers. One enemy. Or is it actually two?