Osamu Kirin has been quietly exterminating the demons that have been appearing in the present day. He asks Towa, Setsuna, and Moroha to slay demons at the concert that is happening.
It all makes sense now.
.أصبح كل شيء منطقيّا الآن
Nun ergibt es Sinn.
Ahora entiendo.
 Conque eres mitad demonio.
Ahora lo entiendo.
Así que eres mitad demonio.
Je comprends mieux.
Ho ben compreso, sì.
Agora tudo faz sentido.
Теперь всё понятно.