Banaza, a merchant, has doubts about a world with racial discrimination. One day, he's summoned to The Magical Kingdom of Klyrode in another world as a hero candidate. However, his level 1 abilities and stats are on par with those of ordinary citizens.
I guess it went up because 
I killed some monsters?
هل ارتفع لأنّي قتلت بعض الوحوش؟
Bin wohl aufgestiegen,
weil ich die Monster besiegt habe.
¿Habré subido de nivel
por matar monstruos?
¿Habré subido de nivel
por matar monstruos?
Vaincre ces monstres
a augmenté mon niveau ?
Mi sa che sono salito 
perché ho ammazzato qualche mostro.
Acho que aumentou
porque matei monstros.
Видимо, поднялся из-за убийства существ.