In the chaotic mix of humans and demons, Shu and Kanna meet in a violent clash worthy of their 12-year-gap as various motives intermingle in a battle engulfed by a sea of flames. Ayano, Sharon and Kisara try to somehow intervene in the siblings' fight that puts the fate of the world at stake. The only way to stop a powerful demon is with the power of a demon. Shu and Kisara join hands once again. Will the accumulation of their feelings reach Kanna, embroiled in her rage? At the end of the battle, what future lies ahead for humans and demons alike?
After all, we ended up
completely relying on a demon's powers.
.ففي النّهاية، اعتمدنا كلّيًّا في النّهاية على قوى شيطان
Schließlich waren wir am Ende dennoch
von der Macht eines Dämons abhängig.
Al final, sí tuvimos
que depender de un demonio.
Al final hemos tenido
que depender de un demonio.
En fin de compte,
Dopotutto, anche stavolta 
ci siamo affidati al potere di quel demone.
Afinal, nós ficamos completamente
dependentes dos poderes de um demônio.
В конце концов...