Musaigen no Phantom World is a fantasy light novel written by Souichirou Shinno and illustrated by Shirabi. It was published in December 2013 and had received an honorable mention in the 4th Kyoto Animation Awards in 2013. The award is for original works that include novels, manga, and scripts, and the winners have a chance to get an anime adaptation by Kyoto Animation.

The story of the original novel takes place in the near future, in a world born of human imagination. What humans would call ghosts or monsters appear, and they come to be called "phantoms." The main character, Haruhiko Ichijo, is a first year at Hosea Academy along with his upperclassman Mai Kawakami, who fights phantoms with the ability "Spirit of Five Elements," Izumi Reina, who has the ability "Phantom Eater," and Koito Minase, who fights phantoms in solitude. They experience the ups and downs of high school life before a certain incident leads them to the truth of this world.

Director: Tatsuya Ishihara (Suzumiya Haruhi no Yuuutsu)
Series Composition: Fumihiko Shimo (Hidan no Aria AA)
Character Design, Chief Animation Director: Kazumi Ikeda (Chuunibyou demo Koi ga Shitai!)
Art Director: Mikiko Watanabe (Amagi Brilliant Park)
Color Design: Kana Miyata (Kyoukai no Kanata)
Accessory Setting: Hiroshi Karada (Hyouka)
Phantom Design: Shinpei Sawa (Takanashi Rikka Kai: Chuunibyou demo Koi ga Shitai! Movie)
Director of Photography: Ryuuta Nakagami (Suzumiya Haruhi no Shoushitsu)
Sound Director: Yota Tsuruoka (Tamako Market)
Music: EFFY