zarwuun: the secret of the magic sword, volume 1, young adult, fantasy book

Under the rule of the Dark Mage Kiantaro, the world of Zarwuun has been divided into colour and black and white for many years. The magical sword Haruna is the only weapon that can destroy Kiantaro and restore balance to the world. The heroine, Tiraya, is unaware of any of this. She overhears her uncle’s conversation, which raises many questions. Looking for answers, she secretly sets out at night on her horse. Her father’s dagger, which she takes with her on the journey, hides a magical secret.
She meets the five Wise Men, who inform her that she was ＂activated＂ by Haruna as a child and that only she can use it to defeat Kiantaro. Together with her travel companions, who will all find out a lot about themselves and each other, she reluctantly embarks on a turbulent journey.