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.
You don't need to be formal with me. 
The more casual, the better.
لا داعي لاستخدام الشّكليات. كلّما
كان الأمر عفويّاً، كان أفضل
Ich brauch keine Höflichkeitsfloskeln.
No hace falta que sean formales conmigo.
No hace falta
que seáis formales conmigo.
Pas de formalités entre nous,
Lenore est suffisant.
Non c'è bisogno di essere formali con me. 
Più siete informali, meglio è.
Sem formalidades, pode
me tratar de igual pra igual.
Без формальностей. 
Так даже лучше.