The name of MO: Astray 's original soundtrack will have the same name as the game, MO: Astray. It includes 31 songs from the game and was created by Rayark's music team SIHanatsuka, whose music design for the game was based around the themes and appearance of the various levels. It also describes the story from beginning to end, as well as the relationship between MO and that mysterious voice in his head. French singer L Lockser was also invited to interpret the theme song Epilogue, as well as including an instrumental version of Epilogue and the version of Epilogue from the trailer.

■ MO
■ Inside world
■ Birth
■ Birth B
■ Escape
■ The Errors
■ Surface
■ Surface B
■ Unknown Area
■ Fatal Trap
■ Fallen
■ Monsters
■ Monsters B
■ The Frescoe
■ Nightmare
■ King of Inhabitants
■ Doula
■ System
■ System B
■ Burning out
■ Uncontrolled
■ Breakthrough
■ Dylan
■ Purpose
■ Termination Weapon
■ Into the sky
■ Extremergy Life Form
■ Epilogue
■ Epilogue - Inst ver
■ Epilogue - Trailer ver
■ Elara