After the Earth were attacked by the invaders coming from another universe using the portal, earth was left into ruins. Mankind were forced to retreat from the lands and developing the artificial island called Ataraxia and developing a weapon referred as Heart Hybrid gear (HHG) which was the only effective way to combat the invaders from the other dimension under the command from Hida Reiri. and you were sent out by her to Ataraxia to help her brother Hida Kizuna on his mission along with Yurishia Farandole, Himekawa Hayuru, Silvia Silkcut, and Aine Chidorigafuchi.

Meanwhile the Vatlantis empire has their elite squad called 'Quantum' under the command of Zelshione along with her companions: Lunora, Ramza, Claydia, Elma, and Ragnus. As well as under the support with Gravel and Aldia from the Izgard squad. And also with the help of Hida Nayuta which was the mother of Hida Reiri and Kizuna

It was your first day after sent out to Ataraxia by Hida Reiri, the commander in Ataraxia

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