This is an indirect sequel to Kakeru Kobayashiri's previous saga Grimoire of Zero (2017). The character of Albus appears in both shows, and this story is set five hundred years after the events of the previous story.
Based on a Japanese fantasy light novel series written by Kakeru Kobayashiri and illustrated by Takashi Iwasaki, with partial character designs by Yoshinori Shizuma, and a spinoff sequel of Kobashiri's earlier series Grimoire of Zero. Kodansha have published six volumes since August 2018 under their Kodansha Ranobe Bunko imprint.