When Amon hands Robin the file for unsolved and possibly Witch related murder cases, she finds a string of deaths that occurred in the very same park she walks through to go to church. There is a young girl who paints landscapes there every day and Robin becomes concerned for her safety. She teams up with Ms. Karasuma to investigate the park, but is she sure the murders were caused by a Witch?

When Robin's Vespa runs out of gas during a rainstorm, she is picked up by a kind-hearted motorist. Shortly after dropping Robin off, the woman is killed in a horrible accident. Upset over her death, Robin senses that a Witch may have been involved. Together with Amon, Robin pushes forward to uncover the truth.

Robin and Amon finally confront Zaizen and learn the truth about Robin's existence. To Zaizen's surprise, instead of being traumatized, Robin is instead strengthened with resolve. Now Robin and Amon must stop Zainzen's final solution for the sake of both Witches and Humans alike.