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The word keisei means literally "castle-destroyer".
Keiseigoto (傾城事): A play set against the background of the pleasure quarters and with a high-ranking courtesan (keisei) as main character.
the keisei line, BTW, doesn't go to Shimbashi, it goes to Ueno, which means you'd have to take the JR Yamanote Line when you get to Ueno.