Mikasa looks at her sword and clean with rice wine. She has mission to take the thief tonight because she has received a customer order, her job is killed at night as a murderer, but she has published good things to kill only the bad guys. Her childhood lived in a mediocre village and was helped by the killer's night head-of-night clan. In her team, she was only girl and another member should be hiding their background as a clan condition rule. When she had the first mission to steal gun powder at the age of 14, she had a big scar on her shoulder and she changed scar to butterfly tattoos. She remembered her first mission as a nightmare, at the same time, her teacher was killed under the secret agents does not want to share the Treasury of the mission together. Before her teacher died, also discovered secrets that these officers had planned to destroy the city for business guns with foreigners. She has a mission as a spy to be slave as cleaner on the ship for finding evidence to report on royal leaders. But the day of the mission her teacher were kidnapped in the forest and were killed behind and her teammates also seriously injured. Then she was the one running back on the ship to take revenge, but these times, the leader thief seized her under the ship and throw her into the sea covering her eyes and ties her hand. Before losing breathing, she was helped by another senior team that hidden under the sea and they fire on a ship for killing the thief. The main team is another team that her teacher has created with royal leaders. However, her teacher reports were stolen and destroys, but the Telecom machine was recorded because one of the royal leaders already copies the thief voice and he was the one whose high technology folder system can create anything . After that, she was sent to work with royal leaders name as Killer Lady Nigh and hid her information like a normal waitress in the light of the Guesthouse Moon. She has always had information on illegal trade, trafficking in human beings and spying from the clan of dark groups whose team thief. And she sent secret messages to her team that the Clan of the Darkness has never had an index that she was the one behind the mask. As she took care to prepare plans to help a teenager trafic in a foreign country tomorrow, she meets new members sent from Royals. They are twin butterfly sisters whose looks older than her. She thought about her job this time perhaps dangerous because the train will cross the tunnel near the village. So, if they used the bomb to stop the train village near the tunnel, we also burned. And they will once have the chance to stop the train when the transversal train tunnel. Twins sister considered a little bit of plans that they will explode the tunnel wall near the river, so that the flow of water destroys the path and not effectively in the village near the train way. After decided these plans, they prepare all the important weapons and workers to work on their mission. Mikasa sit on the first chair start walking in the train behind and she pulled her sword cutting chain that locks. Then she saw many teenage girls who had abuses and tears asked for help. She told them to run in the last room and concealment until the train stops moving and running quickly before the water flows inside the train. As she told them about her plan, the intention of drawing the sound of the guns near her ears while the thief member rises from the sleeping smoke she put on the train. She needs to fight with them before the twin explosion of the bomb as planned. Misaka puts her sword in the middle that the flashing lights that jump at high speed to cut the hand of the thief and protect the bullets that shoot on her. She rotates her leg to hit the neck on the strongest member of the thief who shooting on the stomach. And then, she pulled her knees barely struck his chin that made him fainting while the train slipped into the Wall Path and the water flows quickly on the train. She tries to run but she needs back to help a teenager who was blind and who can't escaped . She was struck by the water behind her after she throws the girl outside the window. The pressure of the water is drowning and her memories of Flashback while she drowned under the sea, she immediately saw her teacher and he told her that she has more time to live to find her real parents, so she gained back her strength and swim without fear and her hand pulled out of train by Sister Twin. The mission was completely and she needs back to her guest house with a twin sister who became new members helping her at the guest house. A few months later, she had letters from her secret team said they found information connected with her parents make her so happy, but when she read the last sentence that the region she needs to cross is the most dangerous area of the forest. And her mission to find her parents as a killer night will also open all the secrets of all clan stories. Mikasa came out of the door and smiled to her new members for the last time without knowing that she could come back to meet them or not. But they always hope that they can meet and work together again.