Ken, a former genius designer now struggling in a repair shop, is urged to join a dangerous underground arena to escape pressure from Skyforge Corp. Despite having no combat experience, Ken is determined to fight using his repaired mech, Zero. He learns the arena’s strict ranking system, starting from zero and advancing through matches to potentially earn a fortune. As Ken prepares for his first fight, he is warned that Skyforge Corp’s top-ranked Ares Mech pilot, a rising star, also competes here. The episode ends with Ken facing the daunting challenge of entering this brutal arena.