Juni Taisen: Zodiac War (Japanese: 十二大戦, Hepburn: Jūni Taisen, lit. “Wars of the Twelve”) is a Japanese light novel written by Nisio Isin and illustrated by Hikaru Nakamura. It was published by Shueisha on May 19, 2015. It is a prequel to their one-shot manga titled Dōshitemo Kanaetai Tatta Hitotsu no Negai to Wari to Sō demo Nai 99 no Negai (どうしても叶えたいたったひとつの願いと割とそうでもない99の願い, lit. “The One Wish That Must Be Granted, and the Ninety-nine That Can Be Done Without”), published on January 8, 2015. The novel is licensed by Viz Media, which released an English translation in October 2017. An anime television series adaptation by Graphinica aired from October 3 to December 19, 2017.
Its light novel sequel, Jūni Taisen Tai Jūni Taisen (十二大戦対十二大戦, lit. “12 Wars vs. 12 Wars”), was released on December 12, 2017.