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.
This classroom is like my garden.
هذا الصفّ كحديقتي
Dieses Schulzimmer ist
sozusagen mein Hinterhof.
El salón es como mi jardín.
El aula es como mi jardín.
Cette classe est comme mon jardin.
Questa classe la conosco come le mie tasche.
Esta classe é como se fosse meu jardim.