Everyone may think that the Tartaros demons are all about death, evil and Zeref and that they have no good in their heart. No love, care, affection or any emotion. But those people are wrong. Everyone has emotions even the most evilest people in the world and the only person who the Tartaros demons will show it to is none other Than Lucy Heartfillia.
After the disbandment of Fairy Tail, Lucy stumbles upon the book of the nine demon gates. The book says that they'll die unless a celestial mage makes a contract with them. So Lucy does it because she hates it when someone dies and she knows that she could say save them. So when Lucy does save them they are contracted to her and their loyalty to their master makes them loyal to Lucy. What'll happen if Zeref and his army comes to Magnolia seeking to start a war? Who will the Tartaros demons choose? Lord Zeref or Lucy Heartfillia.
Read to find out.