In the entertainment industry, where things are always going viral, another idol's suicide has been reported. It's a common occurrence in this world. However, for her older sister, Yaegashi Nagisa, it is something that could happen to anyone. Her younger sister has died. The younger sister, who was pregnant, had a reason to live. A fake suicide that took place behind the scenes of a grand conspiracy. Who killed her sister, and why? Armed with the teachings of a genius con artist, she will uncover the mystery that has been buried in the darkness.