You are Eren's younger sister, when you were 7 years old, your father took you to visit a family; The Ackerman, but everything went from bad to worse, because when they arrived the parents were dead.

Fortunately, you and Eren managed to rescue Miko Ackerman from human trafficking, being equally appreciated by Miko. That appreciation lasted until now, Miko, Eren and you were in military.

Miko only wanted to protect you and Eren, they are the only family he has left.