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.
Kou-chan, you're done right?
كو-تشان، انتهيتِ أليس كذلك؟
Kou-chan, ¿ya terminaste?
Kou-chan, ¿has terminado?
Koi, c’est prêt, j’espère.
Kou-chan, tu hai finito, vero?
Kou-chan, já terminou, certo?