A 4-koma series about a group of sixteen identical cloned middle-school girls attending school in Japan. Each girl is identified solely by the number imprinted on her right eye, ranging from 1 to 16. Under the guidance of a quick-tempered Teacher and her fellow "common sense instructor" Azuma (whose lessons the girls completely ignore), each girl develops her own distinct personality. As clones with no prior life experience and a lack of common sense, they do not hesitate to speak their minds freely, which frequently draws the wrath of their instructor.