With Yuya finished his duel with Crow, he rides into the city as Obelisk Force begins to search for Serena and Yuzu. At the Executive Council building, Roget orders Security to turn their attention to defending the building from Obelisk Force. Inside, the Council comments that Reiji's plan to have the Lancers engage Obelisk Force will fail with so many Lancers sent underground, but Reiji is silently confident they'll do what they must when the time is right. At the stadium, the attendees think Obelisk Force is some sort of event being put on, and Reiji resolves to see how they handle it once they learn the truth. Obelisk Force arrives at the building and are headed off by Sergey, who effortlessly defeats three of them. The Council wonders if they should side with Reiji, or Roget, after this display of power from Roget.
As Obelisk Force searches, Tsukikage hides with Serena and Reira, who are too weak to continue. Reira orders Tsukikage to go underground to tell the others what's happening, and he'll defend Serena. Obelisk Force finds their location and launches a signal flare that numerous other characters also see. Tsukikage runs off but is followed by Obelisk Force. Unwilling to let the underground entrance be found, he stops and duels them. Obelisk Force uses the Continuous Trap "Fusion Trench" to prevent non-Fusion monsters from attacking, sealing Tsukikage's attacks, and letting them attack directly with their own Fusion monsters, taking Tsukikage to 400 Life Points in only two turns. The third Obelisk Force member demands that Tsukikage tell them where Yuzu is, warning he can end the duel on his turn. Tsukikage refuses, and the member prepares to draw.
At that moment, Sora arrives and declares his turn, entering the duel to the surprise of both sides. Sora activates the Continuous Spell "Death-Toy Sanctuary" and swiftly Fusion Summons "Death-Toy Mad Chimera" and "Death-Toy Scissor Tiger," and uses the latter's effect to destroy Fusion Trench. Tsukikage activates his Trap "Barrier Ninjitsu Art of Hazy Transfer" to give Mad Chimera the effect of Obelisk Force's "Ancient Gear Triple Bite Hound Dog." With the borrowed effect, Mad Chimera attacks three times, using its own effect to take control of each monster it destroys. By the effect of Death-Toy Factory, all Fusion Monsters Sora controls are treated as Death-Toy monsters; Scissor Tiger's effect triggers, increasing the ATK of all Death-Toy monsters by 300 times the number of Death-Toy monsters on the field. With his monsters powered up, Sora attacks and defeats Obelisk Force with their own monsters.
Tsukikage goes to the underground to get the others, while Sora agrees to help Reira defend Serena. At their hiding spot, Reira continues to duel Obelisk Force, but their numbers keep coming. Reira visualizes them as the soldiers that took him during the war, and has a panic attack. However, Reira hears Yuya call his name and snaps out of it to see Yuya arrive.
This episode contains examples of:
- Badass Biker:
- Badass in Distress: Many with Serena being incapacitated due to the nerve gas and Tsukikage and Reira from exhaustion.
- Batman Gambit: Whatever he's planning, Reiji thinks that the Lancers sent underground will do what he needs them to do without needing direct orders.
- Big Damn Hero: Both Sora and Yuya. Sora joining in Tsukikage's Duel and Yuya finding Reira before the latter has to fight another batch of the Obelisk Force.
- Comically Serious: Shockingly, Yuri. Well, when you have to deal with Yugo, it's inevitable.
- Cool Big Bro: Yuya who come into Reira's rescue.
- Dirty Coward: The Council once again shows that they're only looking out for themselves. They demand Reiji protect them when the Obelisk Force arrive, however when they see Sergey defeat three of the Obelisk Force, they consider trying to win Roget over.
- Evil vs. Evil: As the intro of the second half of the season has built up, the battle between Roget's Security and Academia's Obelisk Force has begun.
- HeelFace Turn: This episode solidifies Sora's as he defends Tsukikage against the Obelisk Force.
- Heroic BSoD: Reira starts to get one when he's exhausted and starts having flashbacks to his childhood.
- Hoist by His Own Petard: Invoked. Sora finishes off the Obelisk Force with their own monsters.
- Troll: This episode shows that Yuri is one, relentlessly mocking Yugo with almost every line he has.
- The Worf Effect: The Obelisk Force in the hands of Sergey, Tsukikage, Sora and Reira.