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.
Sorry.
آسف
Sorry, meine Freundin lässt
sich ungern was gefallen.
Lo siento.
Lo siento.
Désolé, je crois que ma petite amie
en pince pour toi.
Scusami tanto.
Foi mal.