Miku is gone, and so is Elfnein. The enemy has taken them, and it's up to the Symphogear Wielders to get them back.
which you currently possess, 
to activate something for us.
الذي تمتلكينه حاليّاً لتفعيل شيء لنا
en te servant du corps de Carol
que tu possèdes actuellement.
sfruttando il corpo di Carol che possiedi.
o da Carol, para ativar algo para nós.
А оно нам нужно,
чтобы кое-что активировать.