The Amazing Grace of Σ.

Muqi, a young pop star becomes more and more arrogant, especially with his manager Nagatsuki, a long-time friend who suddenly commits suicide. Muqi finds himself crushed by sadness and guilt. At the funeral, he meets Master Bensheng, guru of a cult his friend belonged to. If at first, he finds comfort within his place, cracks may soon appear in the caring appearances of the cult members.