Youko Sumeragi  

, 皇蓉子

In the book world that mirrors the Russo-Japan War period, there is a woman who serves as an intelligence officer and martial artist. She has gained notoriety due to her actions during training, which resulted in three of her colleagues being injured. Yōko arrives at a train station in contemporary Russian Siberia disguised as a man diplomat named Kohtaro Nanbu, also known as "Adam". Her mission is to connect with him and obtain a film containing radio codes for their intelligence agency.