Shinjuku is a very crowded city, especially around Shinjuku Station.
Just for the JR train lines, an average of 736,715 people a day got on at Shinjuku Station last year. And Shinjuku Station also has the Odakyu, Keio, Toei, and Tokyo Metro lines, too. If you've ever been here, especially on a weekend, you know what it's like.
But it was actually even more crowded last weekend. Can you guess why?