Claus and Lavie progress in the endurance race, but Dio and Lucciola continue to challenge them. Duke Henry Knowles raises the bid price on the Exile artifact, spurring interest among the other auction participants. As Alex attempts to outbid the others, Guild Maestro Delphine Eraclea challenges him and finally raises the bid price to 50 billion Claudia, at which point one of Knowles's men puts a gun at the back of Alex's head, threatening him not to continue bidding. On their final pit stop, Tatiana and Alister pick up a cargo of explosive charges for their mission. When the auction ends, Duke Knowles takes Alex outside and reveals that he wants to avenge the death of his son, captain of the Goliath. Claus and Lavie pull ahead of Dio and Lucciola in the final lap after only filling part of their fuel tank at the last pit stop to lighten the vanship and win the race. At precisely midnight, the explosive charges dropped by Tatiana and Alister destroy Horizon Cave's power generators, leaving it in darkness. Seizing the opportunity, Alex kills Knowles's men and escapes. When the artifact is taken to Delphine, it is discovered to be fake. The true artifact of Exile is revealed to be a Mysterion, one of four phrases with corresponding answers that will reveal the secret of Exile. Graf, the butler of House Hamilton, entrusts Alvis and the Mysterion to Alex. After the race, Lavie tells Claus that she does not want to fly in a fighter vanship but will continue to serve as his mechanic. Claus understands her decision and makes a promise that they will fly together again to cross the Grand Stream. Dio and Lucciola, who are able to see in the darkness, offer to tow Claus and Lavie out of Horizon Cave to the Silvana.
