Mecha Ude: Mechanical Arms

Alien lifeforms known as Mecha-ude can fuse with humans and resemble mechanical limbs. Middle schooler Hikaru Amatsuga becomes the unintended partner of the rare Mecha-ude Arma. The resistance group ARMS assigns dual Mecha-ude user Aki Murasame to watch over Arma, while the Kagami Group searches for a mythical Mecha-ude said to grant unlimited power.