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.
It's useless! Useless!
لا جدوى! لا جدوى
Zwecklos! Zwecklos!
¡Eso es inútil!
¡Eso es inútil!
C’est peine perdue, les jeunots !
Inutile, completamente inutile!
Absolutamente inútil!