The restaurant launched in 1907 at the tail end of the Meiji Period (1865-1912). In 1931, Endo's moved to its current location -- a small, unfussy spot inside the market. I imagine the interior hasn't changed much since then: four tables, and as many seats again at the counter, facing a kitchen of sushi chefs. It's informal dining and the staff doesn't mind tourists, which is a good thing, because they're often the cause of the long lines.
In line with COVID-19 guidelines, the government is strongly requesting that residents and visitors exercise caution if they choose to visit bars, restaurants, music venues and other public spaces.