Puella Magi Oriko Magica: Sadness Prayer

Puella Magi Oriko Magica: Sadness Prayer manga summary: After becoming a magical girl, Oriko Mikuni befriends other magical girls at her school-and not always on initially positive terms! Complications arise when Oriko's friends, unaware they both know Oriko, fight over a grief seed, leading to someone's death...