Tokyo Ravens: Sword of Song  

Tokyo Ravens: SoS, 東京レイヴンズ Sword of Song

In essence, the story revolves around Harutora, who comes from a family of onmyōdō occult practitioners but lacks the ability to see spirit energy. This makes him an ordinary high school student. Natsume, his childhood friend who later becomes the head of their family, reunites with him and alters his destiny.