In an unknown future, after a great human chaos, the Vatican Church has become the spiritual pillar of the European continent, and has countless believers around the world. Its organization, the "Theater Teresa", is a theater on the surface, but is actually an underground military organization to fight against the anti-human extreme military organization "Skull and Cross".
The protagonist Luo Jieer is a member of the organization and a girl who is not yet underage. She will face the dark reality with many people...
This novel is about the issue of faith.