The former basketball rival and supposed arch-nemesis of Kanbaru Suruga. Rouka is characterized by the concept of "schadenfreude," she derives pleasure from the misfortune of others. A self-proclaimed collector misfortunes, she enjoys listening to people's problems whilst offering empty promises of helping them. Turning this form of counseling into a non-profit service, Rouka began to operate under the alias called "Akuma-sama," under which she promises her customers that she can solve anyone's problems with absolute certainty.
Monogatari Series
Araragi Koyomi is a third year high school student who is almost human again after having briefly become a vampire. One day, a classmate named Senjougahara Hitagi, who infamously never talks to anyone, falls down the stairs into Koyomi's arms. He discovers that Hitagi weighs next to nothing, in defiance of physics and common sense alike. Despite being threatened by her, Koyomi offers her help, and introduces her to Oshino Meme, a middle-aged homeless man who helped him stop being a vampire.
