Haruka Sasahara is a fictional character from the anime series Genshiken. She is known within the series as the 'Witch of Poison Apple', a moniker that reflects her sharp wit and sometimes biting remarks. Haruka is the younger sister of Kanji Sasahara, one of the main characters in the series. Her role in Genshiken is to provide an outsider's perspective on the otaku subculture, often questioning and challenging the norms of the group. Despite her initial skepticism, she eventually becomes more understanding and supportive of the group's activities.