Shinjuku Nishiguchi Omoide yokocho is a alleys in Shinjuku district of Tokyo, which is specialized in small bars and taverns. However, there are ticket resellers and other non-food related stores too. Nishiguchi means "west entrance" in Japanese and it is located at west side of Shinjuku station.
Omoide yokocho is officially called Shinjuku Nishiguchi Shotengai(shopping street). At first, the shopping street appeared in 1946, a year after the end of the WWII as a black market. However, gradually black market was cracked down by the police and the stores were changed into food related ones.
The number of stores/bars went up to 300 but most of the stores/bars were squatters; illegal occupations and those were evicted in 1959. Currently there are approximately 70 stores/bars between Palette building and Ome kaido highway. Omoide yokocho is an ideal place for bar hopping during your stay in Tokyo.