The Symphogear System
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Based on the "Sakurai Theory" established by the 2nd Division of the Special Disaster Response Force's former technology expert, Sakurai Ryouko, "Symphogear" is the name of a special counter-measure FG-type armor that was created using relics as a base.
The individuals who utilize this system are referred to as "Adaptors."
The Symphogear's greatest trait is its internal function that plays a melody derived from the Adaptor's thoughts and emotions via sympathetic vibration. By synchronizing that melody with the Adaptor through singing, the Symphogear displays an incredibly high level of battle potential.
The Symphogear system has 301,655,722 different varieties of locks applied to it. Depending on the Adaptor's level of skill and personal battle style, there is a systematic progression of phases that they go through to release the locks.
