Alexander Eiyuusenki ~Saikyou no Tsuchi Majutsu-shi~

In a world where people are given several skills as a blessing from God when they turn 10, the eldest son of the Desemann family, Alec, was only able to acquire one unpopular skill, earth magic - even though everyone in the family is amazing!! But his younger sister Maria says, "You're a monster, big brother."