The Protecter

One day while walking home from Fairy Tail, Lucy comes across a girl who is passed out on the road. The blonde mage takes her home and takes care of her. When the girl wakes up, she has no memories except that of her name. Then upon realizing this stranger saves her life she vows to protect Lucy with her life until her debt is paid. Now she won't stop following the poor girl around!!! What happens when they both show up at Fairy Tail?!?