Onmyou Taisenki  

The Chronicle of the Big Battle between Yin and Yang, Хроника Великой Битвы между Инь и Янь, 陰陽大戦記

Since childhood, Riku Tachibana was raised by his grandfather. The old man had a habit of making unusual hand gestures, which Riku unconsciously adopted as well. His classmates found it amusing. However, one day, Riku realized the true purpose behind his grandfather's teachings. These lessons could determine whether Riku lived or died.