You're Under Arrest!

Major Panic on the Bokutou Line (1) (2x11)

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Miyuki and Natsumi have a roommate situation fight, and Natsumi goes off for a while. Miyuki meets up with some engineers who show her a new robot that can do heavy operations. In the meantime a major earthquake hits the area and the subways are shut down. Natsumi is on the subway by the way.