Summer of Horror Series - Ghost Story! The She-Devil of Firefly Field is the seventeenth episode of Ultraman Ace.
TAC investigates a series of car accidents that have happened at a bypass at 2am, with their only clues being a pair of skeletons. Seiji and Yuko go to investigate and find a mysterious woman in a white kimono with a demon mask who cartwheels away. Yuko follows the demon woman to Tamiko's house, where the girl is alone for the night.
- Ultraman Ace Volume 5 features episodes 17-20.