The first hint of un-easiness at Nomura Securities, Japan's largest brokerage house, is visible right in the doorway of its distinctive, narrow headquarters building in Nihonbashi, one of Tokyo's toniest business districts. Twitchy security men in plain clothes, the type who usually surround prime ministers, stand by the lobby wall. They give each visitor a careful look up and down, and are quick to question anyone who seems out of place.
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