The story is about a young woman who is drawn into a war between kingdoms. She has the ability to command animals, including dragons, as if she was playing a musical instrument.
In the land of Ryoza, the neighboring provinces of Shin-Ou and Tai-Kou have been at peace. Queen Shinou is the ruler of Ryoza and her greatest general, Grand Duke Taikou, defends the kingdom with his army of powerful war-lizards known as the "Touda." Although the two regions have enjoyed a long-standing alliance, mounting tensions threaten to spark a fierce civil war. Within Ake, a village in Tai-Kou tasked with raising the Grand Duke's army, lives Erin, a bright girl who spends her days watching the work of her mother Soyon, the village's head Touda doctor. But while under Soyon's care, a disastrous incident befalls the Grand Duke's strongest Touda, and the peace that Erin and her mother had been enjoying vanishes as Soyon is punished severely. In a desperate attempt to save her mother, Erin ends up falling in a river and is swept towards Shin-Ou. Unable to return home, Erin must learn to lead a new life with completely different people, all while hunting for the truth of both beasts and humanity itself, with tensions between the two regions constantly escalating.—MAL Rewrite
Erin is a bright and curious 10-year-old girl living at the small Ake village with her mother Soyon. The residents of this community are all devoted to the nurturing of a special kind of reptile named touda. Big and powerful, the creature is an important military asset of the country. Soyon is a wise and extremely skilled beast veterinarian who does the crucial task of taking care of these huge animals despite being somewhat disdained by many people due to the prejudice towards her lineage and gender. Erin admires her and wishes to one day become an expert like her mother. Sadly, the mysterious demise of two Kiba, the strongest type of touda, convicts Soyon as responsible for the calamity. Erin must then travel to a faraway land where she grows up trying to grasp a deeper understanding of both animals and mankind.—Anime News Network
Kemono no Souja Erin is about a young woman who is drawn into a war between kingdoms. 10-year-old Erin is a young girl who lives with her mother in the Tai Koh Region in the small Village of Ake. She has a big love for animals, especially the Touda, dragon-like creatures used in the war. Her mother Soyon was originally of the Mist People, an ancient clan who have members with green hair and eyes, and is rumored to follow in the ancient ways, practice magic, and hide in the mist. But despite her genealogy, they stay in the village because Erin's late father was the son of the village chief and Soyon is the head Touda doctor. One day however a tragedy happens which changes Erin's life forever.—AniDB