Siege of Fort Bismarck
While fitting in the air pocket and connecting the broken wire of Kunii on the wings, they managed to drop bricks and five-inch nails onto the German trenches from above to scout the fortress. However, the enemy  Etrich Taube plane flies there and battled them. In contrast to the Taube, who is armed with a Maxim machine gun, the Mo-style plane has only a pistols for self-defense, and Taube, who provokes in aerobatic flight, is forced to disperse. After that, the squadron set up a base on Mount Putuo near the bay to prevent the danger of entering the base. Osugi responds to the request of the islanders, such as Yang Hakurei, the girl dancer Maki saved her from the predicament at a dance festival.  However, a bottled letter reveals that the islanders has a spy among them.