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.

After their defeat by Grabel, Amaterasu needs a new weapon to protect Ataraxia: the Connective Hybrid. To use it, Kizuna will have to perform the climax hybrid with two girls at once! He picks Yurishia and Scarlet, hoping to defuse the tension between them. Will the pleasure be enough to cause them to reunite? And can they retake Guam, and eventually Japan, from the Batlantis empire?

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?