THINGS WERE SETTLING into that liminal part of an early spring day in Tokyo, when it was technically afternoon and not yet dark, but the signs of the evening’s onset were apparent in the dimming light. Commuters had still to pack up and start on their journeys home, though an intangible sense that the day’s work was winding down permeated the offices, greeted partly with elation, partly with panic. School kids were cramming noisily into local tuck shops. Housewives were getting last-minute plastic-wrapped groceries before they prepared dinner.