As the name suggested, this youkai only had one big-eye. He had two horn protruding from his head.
Natsume then ran away when he sensed that this youkai was after him. When Natsume arrived at some path, this youkai was already waiting for Natsume. He wanted to eat Natsume because of the strong spirit he had.
The youkai was defeated by Madara in his true form.
- The end credits list him as One-Eyed Yōkai.