Kyokuten no Honoo Majutsushi ~Fire Ball Shika Tsukaenai Kedo, Motetai Isshin de Saikyou ni Narimashita~

Igni was born into a noble family that aims to be the strongest. At the "Rite of Appropriateness" held on his twelfth birthday, it is revealed that he can only use the elementary magic of fireball, and he is banished from his family home. Igni lives an oppressed life in the town, but when he meets his grandfather, who was once one of the strongest and known as "The Pole," the wheels of fate begin to turn...