Ep. 2: Investigation into Sergei Krainev and Yukina's Brother Disappearance
Aired on April 13, 2010

Sakurai tasks the group with investigating Sergei Krainev, a Jewish Russian violinist suspected by the Kwantung Army of leaking classified military information to an unknown benefactor. Privately, Sakurai informs Yukina that her older brother Isao Takachiho disappeared in Manchuria following their father's death. Aoi and Yukina doubt Krainev is a spy after meeting him personally. During his town hall performance, they realize the fast section of his piece is a coded message intended for radio broadcast. Although they cut the power supply in time, Krainev continues playing for the love of his music.
Episodes
- Ep. 1 · Spies attempt a covert rescue of Japanese president Youzou Kaburagi from Chinese faction leader Zongwu Liu.
- Ep. 2 · Investigation into Sergei Krainev and Yukina's Brother Disappearance
- Ep. 3 · Shadows Fall On The Big Four
- Ep. 4 · Feng Lan seeks photos for her menu while a cat steals film containing a lieutenant's vacation picture.
- Ep. 5 · Kazura investigates Nishio after finding him in a photo, leading to capture and torture by the Kuomintang.
- Ep. 6 · Isao's Pan-Asianist Ideals and the Mysterious Map to the Tea Parlor