We all know Mitsukuni Haninozuka, also known as Honey-senpai, right? Well have you heard of Hikari Haninozuka, Honey-senpai's Big Sister!. Hikari just returns to japan after 5 years of her training around the world. She decided to attends Ouran High school to meet her little brother and her cousin, Honey and Mori. What happen when she joins the host club? and what happens after her long training?