Jellal and Erza run away together as soon as they figured out Erza was pregnant. Together, they give birth to a set of twins. When a tragic incident takes Erza's and Jellal's life, the twins are left on their own to survive. What will they encounter on their journey ahead?

A Satan Soul has been trapped inside of a human body by Zeref's followers. She escapes and lands in a forest in Fiore, where she is found by a little girl who shows her the good in life. After the little girl is killed and taken away by the followers, the soul claims her diary and vows to fulfill the girl's wishes and kill the men who trapped her in a human's body.