I am Levi Ackerman captain of Survey Corps Special Operations. Today Commander Erwin's little sister joined in Survey Corps veteran and eccentric mad scientist and also a medical student. Well, she going to come with Commander Erwin. at first Commander Erwin refuses to let her join as she is Commander Erwin's only family left. But she joined Survey Corps veteran and eccentric mad scientist and I am also going with commander Erwin to take her as she is now going to live with commander Erwin.