Tochoumae and Nishi-shinjuku are not connected underground, at least not in a pedstrian way. you have to exit to the surface then go back down. (unless they add

Tochoumae and Nishi-shinjuku are not connected underground, at least not in a pedstrian way. you have to exit to the surface then go back down. (unless they added something I'm unaware of). Touchoumae looks like it's connect at a glance on google map but zoom in and they are not. Travelled through there every day for years but maybe I missed a hallway.