Suga Shrine is a small Shinto shrine in the Shinjuku area, best known to many visitors for the steep staircase beside it that appeared in the animated film "Your Name." The shrine itself is modest, but the steps have become a popular photo stop for film fans.
It is not a major shrine by Tokyo standards, but it makes a worthwhile short detour if you are already exploring Shinjuku, Yotsuya, or nearby back streets away from the main station crowds.