The narrative takes place in an extremely dark version of the Sonic the Hedgehog series. Driven by a corrupted core directive and a desire for the freedom Sonic possessed, Metal Sonic kills Dr. Eggman, then goes onto encounter Sonic later that same day. The two fight and eventually Metal Sonic catches Sonic and takes him out as well.

Metal then wears Sonic's skin and in doing so inherited the basis of Sonic's memories including his relationships, friendships, and the his mannerisms. Metal even uses Sonic's voice to talk as he considered himself the real Sonic though he can still talk in his own voice albeit robotic and no longer sounding like Sonic.

As Metal spent more time around Tails who had been consumed with grief and delusion he started to grow a connection to preserve Tail's happiness by being his 'Sonic'. He knows he is not Sonic, yet for Tail's sake he continues to play that role for him.

During the event of Metal Sonic killing Sonic and wearing his skin, he was found by Amy and Tails who had come to search for Sonic. Metal Sonic who had been filled with Sonic's memories moved forward and hugged Tails, Amy is deeply traumatized and immediately recognizes the impostor and knocked him unconscious with her hammer, while Tails experiences a severe mental breakdown. After examining Metal Sonic's code and discovering Sonic's memories transferred over—even recalling intimate secrets known only to Tails and the real Sonic—Tails becomes convinced that Metal is actually Sonic and tries to protect him from the others.

Shadow, Knuckles, and Rouge try to intervene, viewing Metal Sonic as a dangerous threat and believing Tails has lost his mind or been manipulated, leading to tragic confrontations where Tails now keeping a gun, runs off with Metal Sonic.

Metal Sonic expresses himself by moving his arms, and his optics. He doesn't have skin himself, he does not have a mouth and has to resort to his voice taking different tones or using various expressions to express himself.

While in agony, Metal's optic lenses will start to glitch out with his visor. During rage, Metal's visor will turn a deep red with his lenses turning black. During panic, Metal's visor gains a blackish-red gradient pattern, with white optic lenses, while a red blood-like fluid leaks from it. While embarrassed, his visor will turn a bright pink to feign blushing.

Metal Sonic by a landslide prefers to be called just Sonic, especially by the original Sonic's friends, often refers to the actual Sonic as a "damned faker who ruined my life", or just outright "the other Sonic", while Eggman as his former imprisoner, creator, and puppetmaster.

Metal Sonic wants to be accepted and have his new freedom acknowledged, he tries to avoid killing or fighting if he doesn't need to due to not wanting to go back to being a 'mindless killing machine' as his original purpose.

Tails has become very overriden by grief and delusion and tries to live out this fantasy of Sonic still being alive. He uses Metal Sonic as that escape while deep down knowing that he isn't truly Sonic, regardless of knowing that he protects Metal Sonic and doesn't let anyone harm him. He wields a gun he took from Eggman's lab the day he went out to his lair.

Amy resents Metal and hates him for what he did, she is unaware that she indirectly caused Metal to gain this want to have the same freedom that Sonic possessed by giving him the inspiration to take the freedom he so desperately craved.

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