Puella Magi Oriko Magica Sadness Prayer(2013)

[Shinyaku] Mahou Shoujo Oriko★Magica: Sadness Prayer

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...

(Source: Yen Press)