The Frontier Incident
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Keyword
GX Episode 0[1][2]
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.