It was a peaceful night. Nothing was happening.
At least it looked like that to humans.

A youkai visits such a human being. It is usually the role of humans to exterminate youkai.
However, he says that such an "incident" is happening, but humans do not move at all, so he is numb.
However, human beings only noticed the "incident" at that time.
A human whose role is to exterminate youkai wondered if "this incident" could be resolved before dawn.

However, youkai say, "This kind of incident" will be resolved by midnight even if you stop the night.
The youkai flew out of Gensokyo at night in search of a piece of the moon.
Humans also jump out to follow.

A human who feels demons and breaks through illusions.
A youkai who sends demons and nullifies illusions.

--They stop the night