Story
『The world is about to freeze』
This world is made up of a vague thing, called people's perceptions.
Each individual's perception is connected to a giant collective perception, which determines the state of the world; so says she inside the laptop (-like object) who seemed to have come from the future.

These perceptions being forcibly applied to the world, and bending reality is the act called magic, she says.
And to use magic, the mind and environment to believe in the existence of magic is necessary, she says.
A mind that can think a lie to be true, that never really existed, is necessary, she says.

She continued.
Forcibly rewritten wishes will soon cause a large contradiction in the world, and finally induce the phenomenon of the world freezing.
Also, she said that in the near future, difficult magical girls will appear and increase the number of magical girls who can use such magic.
In other words, it looks like the world is in a crisis.

＂That's why, Reiko-san, we need your mind that doesn't believe in dreams.
Please become a debugger that corrects the irrational, and save us from this crisis!＂

A negative girl's spanner of justice, will restore fantasy to reality.

Goodbye, opportunistic happy end.