 If you liked
Boku wa Tomodachi ga Sukunai
|
 ...then you might like
Osomatsu-san
|
Similar plot: the two stories focus on a group of several characters, each having an unusual personality. These characters are all excluded from society. Thus, their goal is to become sociable and succeed in becoming "normal" people.
Also, both series are slice of life anime and are heavily focused on humor. Expect a fair amount of sexual jokes while watching them.