M3: Sono Kuroki Hagane
Japanese title: M3～ソノ黒キ鋼～
Alternative titles: M3: Sono Kuroki Tetsu, M3 The Dark Metal, Mortal Metal Memories
Type: TV
Source: Original
Episodes: 24
Status: Finished Airing
Aired: Apr 22, 2014 to Sep 30, 2014
Broadcast: Tuesdays at 01:35 (JST)
Duration: 24 min per ep
Rating: R - 17+ (violence & profanity)
Studios: Satelight, C2C
Producers: Sotsu, Magic Capsule, flying DOG, Happinet Pictures, Bandai Namco Games, Mobcast
Genres: Action, Drama, Mystery, Sci-Fi, Suspense
Themes: Mecha, Psychological

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.

[Written by MAL Rewrite]