Mumei is confined in a classroom full of traps. 
Trying to escape along with his comrades, they set off the traps and are sent to another world.
A strange old man was waiting there. 
Mumei's classmates exhaust themselves without skills going up against an enemy that gets stronger the more he drinks.
A sense of foreboding reaches the bewildered Mumei.
I told you it was useless.
أخبرتكم لا جدوى
Ich sag doch, es ist zwecklos.
Ya te dije que es inútil.
Ya te dije que es inútil.
Te l'ho già detto, è inutile. Inutile, dico.
Eu disse que é inútil.