Benten-yu is a sento in a residential part of Shinjuku that local residents use. It has four kinds of baths, including a cold bath, plus a medicinal bath with ginseng, jinpi and pine needles, and wet and dry saunas. It stays open until midnight, and the lockers have power outlets for charging. The men's and women's bath ceilings are connected, and the shower water is hot enough that you have to fill a basin with it.