Hikari and her sister are off for Europe.  But their plans are interrupted when the Fusou naval fleet is struck by a newly emerged Neuroi nest.  It's up to Takami to defend the fleet against this unexpected threat, but she's overwhelmed by the sheer number of enemies.  When she uses a dangerous technique to stave off the foes, it's up to the inexperienced and underpowered Hikari to protect the fleet...
Sis, are you okay?
أختي، هل أنتِ بخير؟
Takami ! Ça va aller ?
Stai bene?!
Onee-chan, você está bem?