Walk along Tokyo Metro Marunouchi Line from ShinjukuGyoenmae Sta.to YotsuyaSanchome Sta./新宿御苑前～四谷三丁目 

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The Tokyo Metro Marunouchi Line (東京メトロ丸ノ内線, Tōkyō Metoro Marunouchi-sen) is a subway line in Tokyo, Japan, operated by Tokyo Metro. The line runs in a U-shape between Ogikubo Station in Suginami and Ikebukuro Station in Toshima, with a branch line between Nakano-Sakaue Station and Hōnanchō Station. The official name is Line 4 Marunouchi Line (4号線丸ノ内線, Yon-gōsen Marunouchi-sen).
Shinjuku-gyoemmae Station (新宿御苑前駅, Shinjuku-gyoen-mae-eki) is a subway station on the Tokyo Metro Marunouchi Line in Shinjuku, Tokyo, Japan, operated by the Tokyo subway operator Tokyo Metro. It is numbered "M-10".
Yotsuya-sanchōme Station (四谷三丁目駅, Yotsuya-sanchōme-eki) is a railway station in Shinjuku, Tokyo Prefecture, Japan. Its station number is M-11.
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