from the end of the world

Description

I picked up a girl of unknown origin outside. She calls herself a time traveler and comes from the end of the world.
A great catastrophe is coming, when weird things will spread across the land, human civilization will be destroyed, and even the world will be shattered, and everything will be irreparable.
As for me,
I am thinking about how to imprison this beautiful girl who has temporarily lost her power in my own home.