The Tenth Prism (Motion Manga)

A strong country, the “Kingdom of Bones” invades the world. A young man, Tsunashi, who is born to save the world as The Swordsman of Light agonizes over his fate. His powers are awakened with the sacrifice of the life of his best friend. Tsunashi begins his journey to fight against Kingdom of Bones alone. This epic fantasy is written by Masahito Soda.

(Source: Crunchyroll)