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The Lunar Attack#2
Senki Zesshou Symphogear's Main Event.
This is the name given to the events that occurred when the Symphogear adaptors clashed against the spirit "Finè", during her attempt to destroy the moon in order to stop the Curse of Balal from obstructing humanity's mutual understanding.
At the current moment, the crisis that threatened the Earth has been avoided, but it's been acknowledged that this event has become the starting point for numerous paradigm shifts.
The Symphogear System#2
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 relic fragments 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.
Full article: The Symphogear System →Official siteOfficial sitezoid9000
Converter Unit#3
The pendants that the Adaptors keep on them at all times are equipped with a converter function that forms the Symphogear around them, using the energy that is produced by the relic at its core.
In order to activate the pendant the Adaptor must sing a certain phrase, referred to as a "chant."
Full article: Converter Unit →Official siteOfficial sitezoid9000Official site
The Frontier Incident#3
Senki Zesshou Symphogear G's Main Event.
This is the name given to the series of events that occurred as a result of the Lunar Attack. Due to the threat of the moon crashing into the Earth, a group sought to ensure humanity's survival by awakening a prehistoric ruin that slept deep within the Japan Sea - known as "Frontier."
Due to complex ulterior motives of both the world's countries and certain individuals, it's safe to say that the full story will never become clear.