Ginza, Shibuya and Tokyo's other well-known commercial districts are coveted by retailers for their ever-present shopping crowds.

But the nation's largest drugstore chain has found its biggest success story not in Tokyo and not even in a shopping district.

Chiba Prefecture-based Matsumoto Kiyoshi Co.'s busiest outlet is inside Osaka's main train station. It was the 600-store chain's first shop in Osaka.