Ibuki Ikaruga

Ibuki is a high school sophomore who became the de facto head of the Ikaruga family after their parents went overseas (in the manga it is explained that this is due to a curse placed on their father and he and their mother are searching for a way to remove it) and the older sister of Ayame Ikaruga. She secretly likes Yoichi Karasuma but is the first to attack him whenever he becomes embroiled in a situation, usually involving other girls, whether he is at fault or not. In the absence of her father, she is the Assistant Instructor of Ikaruga Dojo, which teaches Ukiha Kamikaze Swordplay but there are only five students in her dojo due to her violent nature; however, she treats children in a maternal fashion. It is revealed in chapter 19.5 of the manga that her violent nature developed when her parents left Ibuki to look after her siblings at an early age. As the story progresses, after coming to terms with the hardships that fell to her after her parents left, thanks to Yoichi and her sisters, she realizes she is in love with him.