1x12 - Descendants of Darkness

Wracked with guilt after Maki's death, Tsuzuki and the others take up jobs at Mariko's high school in order to protect her, however she is terrified that the Guardians of Death actually want her dead. Meanwhile Muraki, intent on using Tsuzki's body to take revenge on his own step-brother Saki Shudo, will do anything to claim his prize, even putting more innocent souls at risk.