Ryuubatsu no Fiera

The Kingdom of Swordland was reduced to ashes in a single night by a dragon that appeared out of nowhere. Princess Fiera, who lost her homeland and family before her very eyes, rises up to slay her sworn enemy, the calamity known as the "dragon," while bearing her brother's will and the unvoiced grief of the people on her still young shoulders!

(Source: Mag Garden, translated)