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.
He did it.
فعلها
Er hat ihn!
Lo hizo.
Lo hizo.
On le tient !
Ce l'ha fatta.
Ele conseguiu!