Keigo Higashino is known for his complex mystery novels, including four books starring the police detective Kyoichiro Kaga. In which Japanese city does the detective work for much of the series?

From Marilyn Stasio’s Crime column for the Book Review in 2018:

Solving one of Keigo Higashino’s fiendishly difficult mysteries must be very gratifying. (I wouldn’t know, since this Japanese puzzlemeister consistently outwits me.) In Giles Murray’s translation of “Newcomer” (Minotaur, $27.99), Higashino’s fabled Tokyo Metropolitan Police detective, Kyoichiro Kaga, he of the “razor-sharp mind and bloodhound nature,” has been dispatched to the Nihonbashi precinct to investigate the inexplicable murder of a middle-aged woman who lived alone and seemed to have no enemies.