(Y/n) the (A/t) is a notorious criminal. Usually, Sonic the Hedgehog is busy with the infamous Doctor Eggman, but when he's not, he's hunting her. However, when the mad doctor develops a new weapon that weakens Sonic, (Y/n) saves him from a close call, taking him to the place where the criminals like her dwell. Still suffering from the effects of the weapon, Sonic has no choice but to learn how to survive in a darker world with (Y/n) as his guide.