Seitokai no Ichizon, Joshiraku Recommendations
The same most-of-the-plot-occurs-in-the-same-room kind of anime.Although,Joshiraku looks more of a traditional japanese anime on the other hand seitokai no ichizon is a modern japanese anime.
Hilarious self-aware comedies about a small cast of characters talking mainly on a single room. They make a lot of references, that only really work if you've seen the anime they are talking about, but if that's your type of humor, both series handle that really well. The first episodes are especially similar, breaking the 4th wall and making some of the same jokes.