D.Gray-man Hallow was announced during Shueisha's Jump Festa 2016 and serves as a sequel to the previous D.Gray-man anime series.

In Japan, six DVD and Blu-ray volumes were planned to collect the episodes, but the home video release was postponed to September 2016 without a specific date.

In March 2017, the official D.Gray-man Hallow website announced the definitive cancellation of the home video release due to 'various unspecified circumstances'.

During recording sessions, manga author Katsura Hoshino was surprised by voice actor Ayumu Murase's ability to switch between Allen's personality and that of Nea D. Campbell, initially thinking he was using a device to modify his voice tone.

Although Murase voiced a scene with the Millennium Earl only twice in Hallow, his performance left a very positive impression on the author.

During a Hallow broadcast, Katsura Hoshino created several illustrations of Allen interacting with the Noah clan to support the voice actors.

The voice actor who plays the Millennium Earl, Aoyama, received praise from Hoshino for successfully voicing both the clownish and lighthearted side of the character and his human form grieving, determined to recover his brother Nea; Aoyama described this dual performance as one of the most difficult of his career.

The series' music was composed by Kaoru Wada, with the opening theme 'Key -bring it on, my Destiny-' by Lenny code fiction and the closing theme 'Lotus Pain' by Mashiro Ayano; the soundtrack, released on September 28, 2016, contains 40 tracks.

D.Gray-man Hallow was one of the most anticipated anime series of summer 2016 according to readers of Anime News Network and the Japanese portal goo.