In the near future, the world is much more technologically advanced than it is today, and Seika has transferred to a prestigious private school with a long history, "Veith Academy for Girls," as an undercover agent.

The school always had a special class called "Renatus," where only the best students are selected to form a class in the name of training the elite. The system was once a skeleton in the school's long history, but recently it has been revived as a special class, in effect.

In the past, it was just one class in the school, but now, it has been changed to a separate school building where only special students take classes. In addition, a dormitory has been set up in the school building, almost cutting off all contact with the outside world. Even though it is the same school, the general students don't know much about the inside, making it a black box.

The purpose of Seika's undercover investigation was to find out and report the actual situation of Renatus. The family of the student who was transferred to Renatus asks for confirmation of their daughter's safety.

Everything is secret.

Seika begins her investigation of Renatus while acting as an ordinary student.