The ultimate demon lord, Astral Trinity, shows up in the form of Arata with a grotesque new appearance. Hijiri appears as well, and the others discover that she is a high-level mage whose goal is to kill Arata and destroy the school.
Let's be friends when we get 
back to the other world.
Lass uns Freunde sein,
sobald wir wieder zurück sind.
Seamos amigos cuando 
regresemos a nuestro mundo.
Seamos amigos cuando 
regresemos a nuestro mundo.
Soyons amis dans l’autre monde.
Diventiamo amici una volta tornati nel nostro mondo.
Vamos ser amigos quando 
voltarmos para o outro mundo.