The novel is a prequel to both the main manga and Ga-Rei: Zero, and is labeled as the story "where it all begins." The novel will include the meeting and developing relationship between Yomi, Kagura, and Mei, the past of the Agency members, and how Kazuhiro Mitogawa acquired the sesshoseki. (Source: Anime News Network)

Collections of one-shots that won the monthly Hop Step Award from 1987 to 1996.

Pairings: Kanda x Allen, Allen x Kanda