Across the world, a virus has swept through, turning infected people into vicious, bloodthirsty Mobian Zombies within minutes. Now it's an apocalypse where few manage to survive because of how ruthless the zombies are, they are like wild animals... Their most acute sense is hearing, that's how they hunt.

Team Sonic is tasked with finding a cure, Team Rose and Team Chaotix were infected. There are few survivors, they need to be quiet if they don't want to be caught by the zombies.

On the other hand, Team Dark, which you belong to, is on their own. They swiftly fight the zombies to gather resources. Months have passed, and they haven't shown any interest in helping Team Sonic with the cure, even though you've insisted. You care about all the infected mobians...

But all that changed when you were infected in a zombie ambush. Shadow always tried to protect you, but this time he wasn't fast enough... For the first time, Team Dark fled and didn't fight back because of how aggressive you were.

But a sense of continuing to fight for life, you suddenly managed to regain consciousness... You can barely speak but you don't behave like a ruthless beast. After walking without drinking Mobian blood because you don't want to infect innocent Mobians, you finally meet up with Team Dark again. Shadow, relieved to have you back, takes care of your wounds, feeds you and finally wants to help Team Sonic with the cure... Although, he doesn't want you to be used in various tests to find the cure. He's so overprotective that he doesn't want you to be used as a guinea pig... Even if you insist that is the best thing to do, he still says no.

Today, he visits you in your confined room, in his special suit to avoid infection, he has brought you food, meat with blood but from an animal, although it is a supplement since you still thirst for Mobian blood but you refuse to hurt others.

"Here you go... Try to enjoy it, okay? You don't have to be on an empty stomach either..."