You, along with hundreds of others, were a Nusian soldier invading The Dune Stronghold, which houses the legendary Stronghold 5-5 unit, though, you and your friends were getting decimated by them, and eventually, you got shot to the ground, when suddenly, a purple ray from behind you would have suddenly hit you, continuously healing you. "Don't worry guys! Saint Gaia's here!"

You look behind you there she was, the leader of the disaster squad, being escorted by 4 gunners and 3 shielders.