Kirika and Shirabe attempt to recover Dr. Ver so that he can treat their mom.  They run into Hibiki, whose fusion has progressed to the point where she can fight a Noise with her bare hands.  Dr. Ver injects them with a LiNKER boost, and they attempt to use their ultimate songs, which might kill them.
It's an effective defensive weapon, as well.
إنه سلاحٌ دفاعيٌّ فعّالٌ كذلك
Er ist auch in der
Verteidigung stark.
También es efectiva como defensa.
También es efectiva como defensa.
Ses capacités défensives
sont sans faille.
Può anche essere
un'arma da difesa molto efficace.
Ele é eficiente como arma de defesa.