In the ruined crater that once held the Forever Fall, forces beyond Remnant's comprehension are stirring. Well, maybe more strolling around looking for Udon and the way home than stirring but that's beside the point; a bald justice has emerged into Remnant with his sidekick, seeking justice and defending the weak. After they fix the moon first that is.

EXOs, mysterious machines built to combat the Darkness as Guardians. Unit 7907636, or Number as he's called, is a Titan Guardian with one purpose; kill. When he crash lands on a strange planet, it is up to him, his Ghost named Shade, and a team of kids to find him a way home.