After defeating the War Gods, Ren and his friends are living the dream. 
It seems like they've finally managed to regain their normal lives. However, a mysterious girl by the name of Pandora appears, bringing with her a box that must never be opened. 
An unfortunate incident results in the box opening (of course), setting the world up for some big changes...
I'll never allow another monster
into this world.
Ich lasse nicht zu, dass je
ein weiteres Monster diese Welt betritt.
No permitiré que aparezcan
más monstruos en este mundo.
No permitiré que aparezcan
más monstruos en este mundo.
Je ne laisserai plus aucun monstre
pénétrer dans notre monde.
Jamais permitirei
que outro monstro entre neste mundo.