In Zero City, Scott, a part-time worker and son of a small dumpling shop owner, discovers a powerful Geostone during a routine delivery, thrusting him into a battle against a space monster. Chosen by the previous Riseman, "V", Scott becomes the new hero wielding the "Rise Spark". Transformed into Riseman, he defends Earth from monsters and protects the Geostone.
However, peace is disrupted by Helborg, a colossal mechanical foe. Despite initial defeat, Scott, aided by Techno Sage Carrie, regains his ability to transform. They merge into the ultimate Riseman Grand Form to vanquish Helborg once and for all.