himawari-san
Himawari-san (Miss Sunflower) is a manga series by Sugano Manami, serialized in Media Factory's Monthly Comic Alive. The titular character is the owner of Himawari Shobou, a local bookstore. Her real name is unknown.
Don't confuse the series with Terry Yamamoto's manga, Himawari-san ~Ishitsubutsu-gakari wo Meizu!~