Kizuna is declared the captain of the megafloat's defense squad: the Amaterasu. For his first mission, he's sent to an uninhabited island to scan for needed resources. But what was supposed to be a safe mission turns dangerous when a miscalculation sends them right into a Magitech ambush. Kizuna's Eros gear is dangerously underpowered, and Yurishia is running desperately low on energy...

Himekawa is guilt-stricken by her failure to protect the citizens as they boarded the Tokyo megafloat. When a mysterious radio signal is picked up by Ataraxia, she leaps at the chance to perhaps finally save a civilian. But when Amaterasu arrives at the source of the signal, they find an enemy from another world, and one deeply connected to Himekawa's past.

Ataraxia is united with the Masters, the aces of the Western USA megafloat. Despite Yurishia being their former leader, they're very cold to her. Their leader, Scarlet, fights with Yurishia over Kizuna, but their battle is interrupted when another leader from the Batlantis Empire attacks!

The eve of the operation to retake Tokyo coincides with the school festival, and Aine is nowhere to be found! Amaterasu is supposed to be giving a big concert performance at the climax of the festival, so Kizuna sets off in search of her. Can he find her and bring her back in time, or will Sylvia have to go instead?

In the climatic battle for Tokyo, Aine attempts to perform a climax hybrid to get the power she needs to defeat the Batlantis royal guard. But doing so means facing memories that may be best forgotten... Can she set aside her fears to gain the power she needs? And should she, if the cost may be the loss of her own identity?