Over the course of the Edo period — , Osaka grew into one of Japan's major cities and returned to its ancient role as a lively and important port. Today, Osaka is a major financial center of Japan. Wikimedia Commons has media related to: Osaka category. In Japan it was here that municipal government first introduced a comprehensive system of poverty relief, copied in part from British models. Host cities of the World Athletics Championships. Greater Osaka has an extensive network of railway lines, comparable to that of Greater Tokyo. Osaka experiences a second rainy period in September and early October, when tropical weather systems, including typhoons, coming from the south or southwest are possible. Cambridge University Press. Osaka hosts four professional sport teams: one of them is the Orix Buffaloes , a Nippon Professional Baseball team, playing its home games at Kyocera Dome Osaka.