ISSUE # X32
E. Honda's stage is called Edo no Yu (江戸の湯, Hot Water of Edo) in Street Fighter II. It is inside of a fictional sentō (銭湯) (public bath) in Kapukon Yu (加富根湯). A fun fact, you can see the bathhouse in Street Fighter Alpha in Ryu's stage.
According to the backstory Honda was raised in a large bathhouse since a young age. Since Honda loves both sumo and hot baths he decided to combine both and made a sumo ring in the public bath. The decorative illumination is operated and lit on from a back room by Honda’s disciples.