Night Raid 1931

The group is tasked on a covert mission to rescue Japanese conglomerate president Youzou Kaburagi from the hands of a small Chinese military faction led by Zongwu Liu. Even though the four spies had a run in with three decoys the previous night, Yukina Sonogi deduces that Kaburagi is held captive at a fort near a riverbank east of Nanjing. Sakurai informs them that Zongwu kidnapped Kaburagi to use as a collateral for obtaining weapons and ransom money to attack the Kuomintang. While Yukina stays hidden with Natsume Kagiya in the forest, Aoi Miyoshi and Kazura Iha enter the fort at night disguising themselves as soldiers, as they confront Kaburagi for using his captivity as a business offer. They are found out after knocking the president unconscious. Aoi later convinces Kazura to use his ability of teleportation to make their escape outside the fort. It turns out that Kaburagi signed a document to permit a shipment of weapons to the allies as well as the enemies.

Sakurai requests the group to investigate a Jewish Russian violinist named Sergei Krainev, who the Kwantung Army suspects is a foreign spy who has been leaking out classified military information to an unknown benefactor. Yukina is told privately by Sakurai that her older brother Isao Takachiho had disappeared to Manchuria after the death of her father. Aoi and Yukina sees no reason as to why or how Krainev could be a spy, after having met with him personally. While Krainev begins his performance at the town hall, Aoi and Yukina realize that the fast section of his piece is a coded message that will be broadcast by radio. Even though they cut off the power supply of the town hall in time, Krainev continues to play for the love of his music.

Yukina receives a letter from her missing brother, saying he wants to meet her, but overshadowing all that is the much more immediate bomb threat involving the four department stores in Shanghai known as the Big Four. The assailant lets Yukina read his mind, regarding the location of the three remaining bombs. While Aoi and Kazura search the other two stores to extinguish two of the bombs, Yukina and Natsume remain at the store where they are in to disarm the third one. It is revealed that the assailant is Kuse, who was sent to retrieve Yukina. Kuse is a subordinate of Isao with the abilities of teleportation and telepathy. To make matters worse, Aoi finds a young girl in one of the stores, also having to evade Kuse at the same time. As the four spies meet up with each other, Kuse retreats after being overwhelmed with their combined attacks.