The Okinawa Defense Battle (沖縄防衛海戦) was an event where the Great Asian Alliance attacked Okinawa in 2092. Miyuki, along with her mother Miya and her mother's , Honami, took refuge in the army's shelter. Due to internal JSDF conflicts with the Left-Bloods, they were caught in a dire situation. Under the effects of Cast Jamming, they couldn't defend themselves. When the Psion waves weakened, Miyuki activated Cocytus and froze the mind of one of the attackers, after which they were shot by the other attackers. Almost dying, Miyuki, Miya, and Honami were saved by Tatsuya, who used his innate ability Regrowth.