A Mecha-ude who was being used as a weapon by Kazuwa. They were turned into a serpentine sword because they were being mind control by a Shackle created by the Kagami Group. They were originally famously known as a Mecha-ude that's very smart and had a keen mind. Once they were freed from the Shackle, they speak in a much calmer way.

New anime project for MECHA-UDE, as a full-fledged anime series. 
Long ago, alien lifeforms came to Earth, fusing with people on the planet. Due to their appearance, they were dubbed "Mecha-ude," as when fused, they bore a striking resemblance to mechanized limbs. 

Through an involuntary partnership, average middle schooler Hikaru Amatsuga works alongside the Mecha-ude Arma, who is an extremely rare and special existence. To protect Arma, the resistance group ARMS assigns the dual Mecha-ude user Aki Murasame to follow him wherever he goes. However, she is also looking for a mysterious Snake-Type Mecha-ude wielder, who has put many of her comrades in a critical state. 

Behind the scenes, an organization known as the Kagami Group is searching for the mythical "Trigger Arm," a Mecha-ude said to grant unlimited power. When Aki's life is threatened by this group, Hikaru must team up with Arma to find the courage to fight back and, along the way, learn that his life will never be ordinary again. 
(Source: MAL Rewrite)

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Kita-Kagami City is a pretty normal town... except that some people have gotten their hands on Mecha-Ude: powerful, sentient mechanical beings attached to the limbs of their hosts. When middle school kid Hikaru accidentally activates Alma, a mysterious Mecha-Ude with no memory of his past, he forms an unlikely connection with the talking arm. But where did Alma come from? And why are shadowy secret organizations and corporate assassins with deadly Mecha-Ude of their own suddenly chasing Hikaru down, hell-bent on stealing Alma? Hikaru and Alma must learn to work together to uncover the truth behind Alma’s identity and prevent him from ending up in the wrong hands (or on the wrong arm)!
 
(Source: Azuki)
 
Note: Chapter 12.5 is included in the chapter count.

Adel