Haruka is Keitaro Urashima's "aunt". Haruka is constantly seen smoking a cigarette. Like Naru, she has a fiery temper (and great physical prowess to match), which she hides under a calm, detached exterior. Once a fellow student and love interest of Seta, she became fed up with his obsession for archeology, his tendency to get into trouble, and his apparent obliviousness to her feelings and left him.
