Stubborn Aesthetics - S1.E4

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?