After an ice comet transforms Venus into a habitable world, humanity's colonization dreams come true. Yet, the harsh reality of failing crops and resource disputes shatters their utopia. Tensions escalate between continents, pushing them to the brink of war. When journalist Susan Sommers lands in Aphrodia during an Ishtar invasion, only Hiro Seno and his Battle Bike crew prevent her demise. Now fugitives in their own land, Sue, Hiro, and the team rely on their Battle Bike prowess—merging motorcycle racing with roller derby—as Aphrodia's ace to triumph in the impending Venus conflict.