I checked for places in Shinjuku where you can sit for free, and…
I didn't see Shinjuku East Exit Station Square mentioned!
I remembered this after visiting the seating area at Shinjuku East Exit Station Square.
It's a perfect spot for a break or to get some work done, especially when the weather is nice.
※When you get your bench card, the location is different from the map.
I couldn't mark the rest area on the map, so I marked a nearby spot instead.