Noir is the 3rd son of a poor noble and his job position is taken away by a more powerful noble. He also sadly lacks enough skills to attend the Hero Academy. He tries to find a way to be able to use his skill [Great Sage] better and stumbles across a hidden dungeon.
Activate the switch in the wall, 
and you will find the Infinite Labyrin—
...فعّل الزرّ في الجدار وسوف تجد المتاهة اللّامتناهية
Hinter einer falschen Wand
befindet sich ein endloses Labyrinth.
Si activas el interruptor en la pared,
encontrarás el laberinto infini…
Si activas el interruptor de la pared,
encontrarás el laberinto infini…
dissimulé par un mécanisme d’un mur,
se trouve le labyrinthe infini.
Attiva l'interruttore sulla parete 
e troverai il Labirinto Infini—
Ative o dispositivo na parede e
encontrará o Labirinto Infini—
Используй переключатель в стене 
и найдёшь Бесконечный лаби...