Yuuki Kaji, Nobuhiko Okamoto, Ryota Ohsaka, more reprise roles from Otomate's original game

The official website for Nil Admirari no Tenbin (Libra of Nil Admirari), the television anime adaptation of Idea Factory and Otomate's Nil Admirari no Tenbin: Teito Genwaku Kitan romance game, began streaming the anime's teaser video on Sunday. The video reveals the anime's staff and cast, as well as the spring 2018 premiere.

The anime features a returning cast from the game, including:

Yuuki Kaji as Hayato Ozaki Nobuhiko Okamoto as Akira Kōgami Ryota Ohsaka as Hisui Hoshikawa Ryohei Kimura as Shōgo Ukai Kenichi Suzumura as Shizuru Migiwa Takahiro Sakurai as Rui Sagisawa

Masahiro Takata (Super Seisyun Brothers director, Kenka Banchō Otome: Girl Beats Boys episode director) is directing the anime at studio Zero-G. Tomoko Konparu (Uta no Prince-sama - Maji Love 1000% all four seasons, Kimi ni Todoke - From Me to You both seasons) is overseeing the series scripts, and Yukie Sako (Pretty Guardian Sailor Moon Crystal first two seasons) is designing the characters. Tomoki Hasegawa (NANA, Sayonara, Zetsubou-Sensei) is composing the music at Pony Canyon.

The story of the game is set in the Taisho Era at the beginning of the 20th century — except the era did not end in 15 years (as it did in real life) but lasted 25 years. To protect her family who fell from their former glory, a girl decides to marry a man whose name she does not even know. However, before she does, her little brother commits suicide in a mysterious fire, with an old book in hand.

The Imperial Library Information Assets Management Bureau — also known as "Fukurō" — then appears before the confused girl. According to the Fukurō, there exists books called Maremono, which exert a great influence on those who read it. Moreover, the girl gained the ability to see an "Aura" due to the incident with her brother. Despite her confusion, the girl chooses to leave the "birdcage" of her former life.

Otomate released the original game in April 2016. Otomate is developing a sequel titled Nil Admirari no Tenbin: Kuroyuri Enyōtan that will ship on September 21. Satoi and Yuma Katagiri are returning as illustrator and scenario writer, respectively.