Tokyo prefecture located on the Pacific Ocean-side of the Kanto region is the center of Japan with capital functions. There are 23 wards, 26 cities, 5 towns, and 8 villages in Tokyo prefecture. Tokyo is known as the place where Edo Shogunate operated during the Edo period, and since then, it has developed as the center of Japan’s politics and economy. The prefectural population is the largest in Japan with over 13 million people. Complicated transportation networks are developed in the central metropolitan area, and JR East Japan’s Yamanote loop connects Tokyo, Ueno, Shinagawa, Shibuya, Shinjuku, and Ikebukuro. These stations function as gigantic terminals where many railway lines merge together. In particular, Shinjuku station has the largest number