Taking place in the year 1937 on the eve of World War II, the story involves a mysterious spy training organization known as the "D Agency." The organization is established by Lieutenant Colonel Yuuki from the Imperial Japanese Army. His ideals lead him to recruit people beyond military academy graduates and personnel, while training them to become skilled agents in arts of manipulation. These agents would become a specialized team to conduct operations. One such antihero agent, under the name Jirou Gamou, goes on a harrowing mission to uncover secret documents titled "Black Notes," while battling forces from within and without his own ranks.

Yurika Aizawaas Woman (voice)
Tomokazu Sekias Lieutenant Sakuma (voice)
Kentaro Toneas John Gordon (voice)
Binbin Takaokaas Principal of the Imperial Japanese Army Academy (voice)
Mitsuki Nakaeas Geisha (voice)
Nobuyuki Hiyamaas Alain Lernier (voice)
Shizuka Itohas Marie Torres (voice)
Ryota Takeuchias Jean Victor (voicee)
Atsuyoshi Miyazakias Hanabishi Employee (voice)
Kenji Kawai