"Doctor, can you tell where this is?"
"There's just sand here, and I don't have the ability to taste sand and know its origin."
The blue-eyed middle-aged man shook his head on the rooftop, squinting into the distance of the desert:
"I've been to many places tracking demons, but I've never been to the desert regions. Demons tend to appear where humans congregate. Only sealed demons exist in such desolate areas, and these sealed entities are the hardest to find."
"I've been in the Green Lake Region all this time, and haven't encountered a demon... actually, I have."
He briefly described, during the past 'Seven-day Trip Story,' the glass bottle with seven-colored smoke and the blue giant that appeared from the river, to which the doctor showed a sudden look of realization:
