Nanako Yukishiro is a typical cute and cheerful high school girl, with one exception: she does not speak! Her sole way of expressing her thoughts and feelings is through senryuu—a type of haiku that uses the 5-7-5 syllable structure. Nanako's high school life has never been more enjoyable, surrounded by friends like the misunderstood former delinquent Eiji Busujima, the stalkerish and perpetually single club president Amane Katagiri, the shy yet talkative artist Kino Yakobe, the mysterious Tao Hanakai, and Eiji's self-proclaimed "big sister" Koto Ootsuki.