2031 year. Meet Mia. This is a sweet girl, quite recently she led an ordinary life. She had friends, a beloved Thai cat, a home, and ... a good responsible job as a cyber security engineer in a large Japanese international corporation "KIANA". This corporation is engaged in the development and implementation of security systems in the arms industry. One day, Mia got the opportunity to see the encrypted data of the top management of the corporation. An inquisitive mind outweighed all boundaries of corporate ethics. Now Mia is not just a girl, but the main target of the KIANA corporation. She lost everything, but not the thirst for justice. And also acquired something. Out-of-law hacker title. And a new pseudonym ... "Black Mamba".