Hozuki Gorou is your average high school student in all respects, except for having a crush on his sadistic older step sister, Haru. Haru delights in toying with her step brother: flirting, deceiving, and humiliating him at every given opportunity. Serialized in Young Ace, Igarashi Ran's 4-koma crack comedy follows the relationship between the two step siblings and the troubles of their daily life.