Ginta Toramizu dreams every night of a magical world he's sure must be real, until a mysterious door pulls him into MAR Heaven, a land built around powerful weapons called ARMs. Teaming up with new allies he meets along the way, Ginta searches for a way home while getting swept into MAR Heaven's brewing conflicts and the hunt for the strongest ARMs of all. What starts as an adventure through an unfamiliar world quickly turns into Ginta's fight to protect it.