Dark Witch Meruru is an antagonist in Stardust Witch Meruru, a fictional series within Ore no Imouto Konna Ni Kawaii Wakke Ga Nai (Oreimo for short). She appeared in the 3rd season of Stardust Witch Meruru and is the Dark Witch form of the show's main protagonist Meruru. She turned against the other magical girls and then she headed towards space to use Planet Burst to rip the Earth right through its core. Thanatos Eros might be behind her transformation.