From the end of the world

I picked up a girl of unknown origin outside. She claimed to be a time traveler from the apocalyptic era.
The catastrophe is coming, when monsters will spread all over the earth, human civilization will be destroyed, and even the world will be shattered, and everything will be irreversible.
regarding me,
I am thinking about how to imprison this beautiful girl who has temporarily lost her power in my own home.

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