This is one of the very few remaining yose (vaudeville) theatres in Tokyo. Shows feature over a dozen acts, many of which are rakugo (comedic monologue). You’ll need pretty good Japanese to follow along, though there’s something to be gained from just soaking up the atmosphere. On Saturday evenings (9.30pm to 11pm) there's a short rakugo program for just ¥1000.
The theatre itself is pretty cool, with an old-style wooden marquee framed with lanterns, and with the names of the performers handwritten.