[1] It is directed by Junichi Sato, written by Mari Okada and has mecha designs by Shōji Kawamori.

It starts at an ordinary school in a city of close proximity to the Lightless Realm and focuses on Akashi for the most part.

A man approaches him with an invitation to join a special force that is tasked with defeating the Corpses and uncovering the secrets of the Lightless Realm.

It sings a lovely melody and like a countdown, over the next few months it is discovered that Emiru has become infected by the Necrometal that has plagued the Lightless Realm for so long.

[6] The series was acquired by Daisuki for online simulcast streaming with English, Traditional Chinese and Spanish subtitles worldwide except in Japan and China.