Saito and Akinari Nao launched the Trinity Seven manga in Kadokawa’s Monthly Dragon Age magazine in 2011.
Trinity Seven: Heavens Library & Crimson Lord (Trinity Seven: Tenkū Toshokan to Shinku no Maō), the second film in the franchise, opened in Japan in March 2019.
The Trinity Seven: Eternal Library & Alchemic Girl film opened in Japan in February 2017.
Saito most recently launched the Kojirase Tensei Maō to 7-nin no Oshikake Otome no Ragnarok System (The Unconfident Reincarnated Demon Lord and the Seven Unwelcome Maidens’ Ragnarok System) manga with GUNP in Akita Shoten’s Monthly Champion RED magazine in October 2022.