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 two bodies are found apparently burned from the inside out, attention is drawn to Robin; whoever did this has the same power she has. A girl named Aki Yoshioka is the best suspect, but when the STN-J investigates they only find a pile of sand and a confession to killing three people on Aki's computer. Is the team chasing a ghost?