The instructor for the study of imaginary beasts, Balam Shichiro, can't help but touch any living creature he comes in contact with. Because he looks rather terrifying, the students are generally pretty scared of him. During class, Balam notices that Iruma doesn't have wings on his back. If it's found out  that Iruma is a human in the netherworld, only trouble awaits. But despite all of this, Iruma says the most surprising thing to Balam...
That's why we demons attained 
wings during our evolution.
.لهذا نكسب نحن الشّياطين أجنحة أثناء تطوّرنا
Also haben wir Dämonen uns entwickelt
und Schwänze wie auch Flügel erlangt.
Los demonios obtuvimos cola
y alas al evolucionar.
Los demonios obtuvimos cola
y alas al evolucionar.
C’est ce qui explique
que les démons
Ed è per questo che noi demoni
abbiamo sviluppato le ali durante l'evoluzione.
Por isso, nós, demônios, obtivemos
rabos e asas através de evolução.
Именно поэтому мы, демоны,
эволюционно обрели крылья.