As the village chief gave the signal to start, the ninja silently scattered into the mountains of the village all at once. Today, the training exercise of Hidden Demon, born from the chief's whim, begins again.

No one knows what will happen during the Hidden Demon training. That's because anyone caught by a demon is given one command. What that command might be is unknown, but it was a rule that it had to be obeyed. In any case, they must escape. It seems Yoichi is one of the demons this time. The participants were visibly varied: some tense, some brimming with motivation, and some resigned.