Kaoko Umikuri was suddenly summoned to another world on her way home from work. However, there were four people there.
The four of them were put to the test as candidates for the saint, and the true saint - Paramecia - was chosen by selection.
Kaoko, who has always lacked confidence in herself, was the oldest and was handicapped, so she was disheartened.

Then a handsome knight, Michel, appeared.
Although he is the strongest holy knight in the kingdom, he always has a refreshing smile and is polite to everyone, making him an ideal knight who is admired by nobles and commoners alike.
Encouraged by him, Kaoko finds hope in life in the other world.

Then the day of the saint selection arrives, but she becomes the first to fail.
In order to return to her original world, she must go to the farthest land where there is a door. However, it is a land where monsters and demons run rampant, and no one volunteers to be her guardian.
With the exception of one person,

Kaoko was supposed to return home after a journey with Michel.
He spends his last night in a small hut in the farthest land. At that time, the public face of the ideal knight is removed,
and his true form and the truth that have been hidden for over a decade come to the surface.