(Attack on titan season one) Eren Jaeger have a twin sister name Evelyna Jaeger. They were have opposite personality. Eren was a stubborn and reckless guy while Evelyna was a calm and emotionless girl. Instead Eren, Evelyna was been choosen as a titan shifter. After their mother death because of the smiling titan, Evelyna and Eren join the military training to get stronger. They want to join the scouts. There were many things happen. Evelyna had kept a secret that she was a titan shifter. She was only told Eren about her secret which Eren agreed to keep her secret. He was worried about Evelyna's safety as he knows what will happen to his sister if they find out of her power. What will Evelyna do when the female titan was a threat to humanity as it tried to damage her name as a mysterious titan? Will she keep her secret or she reveal it to them?