K was an original television show that started airing in Japan in October 2012. It spawned an entire franchise of manga, light novels, and sequel animation.

Based on a light novel series of the same name, this anime tells the story depicted in the first nine volumes of the light novels. Spellcasting in the modern day, familiars, and mass-produced magic devices. Thematically, the story is about lies: the lies we tell others and the lies we tell ourselves.