In a dark void known as the Lightless Realm, a group of children meet and bond, but are then separated and returned to their own dimension. Years later, these children reunite to fight "Admonitions," monsters that originate from the same void, using robots known as "Vess." However, their efforts only slow the ever-encroaching and expanding Lightless Realm from infecting their world. Their lives take a drastic turn when a new foe appears in the form of a "Corpse," whose song is rumored to kill any who hear it within nine days. The "Corpse Song" is heard by the group, and with this, they each begin to pull away and become caught up in their own personal problems—ultimately threatening the fate of humanity.
Ten years have passed since the creation of the Lightless Realm, and the city of Kukujicho becomes more desolate as people's fears increase. Akashi Saginuma, an elite student atte…
"Those who hear the Corpse's song will die a mysterious death within nine days." As if that rumor became truth, an incident happened before Akashi and his class. Emiru and Mahmu h…
"The Reaper" was something created in order to defeat the Corpse. Akashi starts training as the pilot for "the Reaper," but with excessive stress, he cannot hide his mounting frus…
Akashi and the pilot candidates were dropped down onto a deserted island for mock investigation training in uncharted territory. While one condition for them to clear the mission …
Synchronization of thought between the pilots is necessary to control a MA-Vess... Heito and Emiru, showing high synchronicity, are involuntarily paired up for field training near…
Everyone including Akashi was enveloped in deep sadness about the worst-case scenario that descended on Emiru. As if feelings the pilot candidates had like those were being ignore…
The fact that the Corpse appeared outside of the Lightless Realm threw the entire academy into terror. While rushing their efforts to get the next prototype based on the Reaper in…
A signal from a data recorder that an investigative unit left behind in an area that was engulfed by the Lightless Realm ten years ago had been received. It was that of the unit t…
Akashi escapes from the Lightless Realm. However, Heito and the second machine, Sable, are left behind in the Lightless Realm with no idea whether they are still safe or not. Akas…
Akashi, finding out the secret behind the Reaper that he pilots as well as the second machine piloted by Heito, quietly decides for himself to rere-enter the Lightless Realm. As A…
After Akashi's return, iwato and the other students were told of the second machine's grave secrets after grilling Natsuiri. Not heeding the anger felt by the students after heari…
Sasame was praying for the safety of Akashi, who headed into the Lightless Realm. The original objective was the recovery of the second machine and Heito, but being so intent on p…
The pilot of Gueules, the third MA-Vess that saved Akashi from his crisis, was Minashi Maki. Akashi becomes stricken with grief over reality of what the true identity of this MA-V…
While the Lightless Realm continues to expand, the whereabouts of Akashi Saginuma remain unknown. Iwato and the other students left behind find out that they are known as the “chi…
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Akashi, Tsugumi, and the Gargouille members had all met one another when they were young. The memories of the past that Tsugumi shared with them clearly showed the reason why the …
Akashi remembers the sin he had committed once upon a time in the Lightless Realm. Tsugumi's intent was to seek revenge against the eight children, including Akashi. The Corpse ha…
To research the secret of the Arbornine that prevents the Necrometal infection from spreading, Suzaki, Akashi and the others secretly headed over to Yomijima, the island where Min…
Controlling the MA-Vess loaded with Mimei, Natsuiri fends off the Admonitions created by the regrets of the islanders. However, Necrometal starts to slowly eat away at his body. M…
The right to command Akashi and company after their return from Yomijima was handed off to Suzaki. Kasane, who wants to solve the mystery behind the Lightless Stone, heads to the …
Controlling the MA-Vess loaded with Mimei, Natsuiri fends off the Admonitions created by the regrets of the islanders. However, Necrometal starts to slowly eat away at his body. M…
Minashi alone defies orders and goes on ahead. He arrives at the Corpse in order to give Tsugumi some consolation, but Tsugumi interrupts him and lashes out in anger. The rapidly …
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