Butterfly (Erwin x OC x Levi)

Purcella Aster spent the first part of her life in the Underground. On the day she is to prove her worth to those who taught her to survive, the truth to her identity appears. Thrown into a world filled with new dangers, she vows to discover the truth beyond what she's known. Then she meets Erwin and Nile and her world changes all over again. After all, life can never be simple.