Culture, Destruction, Past (文化, 破壊, 過去) is the 11th episode of the anime adaptation.
Yuuri discovers that Nuko likes to eat bullets and begins feeding it while Chito finds a book on war and civilization written in English. They soon arrive at a huge clockwork-type contraption, where music starts playing on the radio again. They decide to head towards the source of the broadcast.
The girls are interrupted by an incredibly large robot which crashes down in front of them. Nuko powers up the robot and Yuuri tries out some of its weapons, causing massive destruction to the city. The next day, the girls follow the music's signal to a still functioning submarine lying in the snow, inside of which they find an array of nuclear missiles.