M3: Sono Kuroki Hagane

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Alternative Titles

Synonyms: M3: Sono Kuroki Tetsu, M3 The Dark Metal, Mortal Metal Memories
Japanese: M3~ソノ黒キ鋼~


Type: TV
Episodes: 24
Status: Finished Airing
Aired: Apr 22, 2014 to Sep 30, 2014
Premiered: Spring 2014
Broadcast: Tuesdays at 01:35 (JST)
Licensors: None found, add some
Studios: Satelight, C2C
Source: Original
Genres: ActionAction, DramaDrama, MysteryMystery, Sci-FiSci-Fi, SuspenseSuspense
Themes: MechaMecha, PsychologicalPsychological
Duration: 24 min. per ep.
Rating: R - 17+ (violence & profanity)


Score: 6.571 (scored by 1877818,778 users)
1 indicates a weighted score.
Ranked: #64632
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #2910
Members: 56,766
Favorites: 81

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Ranked #6463Popularity #2910Members 56,766
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Episodes: /24


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]


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Related Anime

Characters & Voice Actors


Yoshida, Kento
Okamura, Takema
Assistant Producer
Satou, Junichi
Hamano, Takatoshi
Sound Director


Opening Theme

Apple Music
Amazon Music
Youtube Music
1: "Re:REMEMBER" by May'n (eps 1-13)
2: "Replica (レプリカ)" by Maaya Sakamoto (eps 14-23)

Ending Theme

1: "ego-izm" by la la larks (eps 1-13)
2: "SABLE" by nano (eps 14-23)
3: "Replica (レプリカ)" by Maaya Sakamoto (eps 24)


Oct 7, 2014
First of all, I'd like to say that the key to truly enjoying M3 is having an interest in a series that not only showcases sci-fi/fantasy elements but also has the tendency to go deep into the characters' psyche, exploring their personalities and how they came to be like that. I'd go beyond that and say it's not so much about the story but the journey these people go through and the very simple yet effective and truthful message it’s trying to convey about what connecting with others truly means.

Story 8/10

It starts really slow and sligthly confusing. I'd say this is the main downfall ...
Oct 3, 2014
Mixed Feelings
Ok, so I've just finish watching this 24 episode anime and quite frankly I have mixed feelings about it, so I'm gonna cut to the chase and just present my ratings for this anime:

Story: Decent 4.

The problem with the story was that it has too much in it that the plot and the story-line itself wasn't easily understood, especially when it has a mixture of sci-fi mixed with supernatural, in my opinion the two genres are like oil and water that don't mix, it also has a combinations of "SOMEWHATS" and SOME SORTS"and I do mean "SOMEWHATS." First of all there is that somewhat of ...
Jan 23, 2020
This was something I had grabbed because I wanted to watch another mecha show. (And it was recommended from the Bokurano page, so yet another downvote for MAL recommendation givers.) I really should have grabbed almost anything else.

The characters are about as unlikable as possible, and the stilted and awkward dialog does nothing to help with that. I was actively rooting for the big bad to kill all of the kids off, but only after the grownups had been piled up and burned alive so at least some of the screaming would actually have a purpose behind it. The plot is inane technobabble stirred ...

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Recent News

Spring 2014 Simulcast List [Update 4/19]

Spring 2014 Simulcast List [Update 4/19]

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Recent Forum Discussion

Poll: M3: Sono Kuroki Hagane Episode 24 Discussion ( 1 2 )
Stark700 - Sep 29, 2014
76 repliesby Erdgeist »»
Mar 21, 8:23 PM
Poll: M3: Sono Kuroki Hagane Episode 10 Discussion
Stark700 - Jun 23, 2014
45 repliesby Phobossus »»
Mar 17, 7:41 AM
Poll: M3: Sono Kuroki Hagane Episode 23 Discussion
Stark700 - Sep 22, 2014
27 repliesby Archean-Return »»
Jul 29, 2023 11:30 AM
Poll: M3: Sono Kuroki Hagane Episode 22 Discussion
Stark700 - Sep 15, 2014
25 repliesby Archean-Return »»
Jul 29, 2023 10:58 AM
Poll: M3: Sono Kuroki Hagane Episode 21 Discussion
Stark700 - Sep 8, 2014
25 repliesby Archean-Return »»
Jul 29, 2023 10:27 AM