In spite of his frantic efforts to get Ruri back from the Pairon, Rumina loses her right in front of himself again. Rumina and his fellows find the wayito charge into the Company where Ruri is confined, but the yo-yo user, Kourin and his brother soldier sent by Pairon stand in their way. Beating the assassins, Rumina faces Pairon's incessant attacks... The explosive devices Pairon has set up burst and throw them into the abyss and get trapped in the lawless town, Slum located at the very bottom of the Underground. Can they get out of the nadir of the world and save Ruri?

Episodes:
19. Frustration - Unfulfilled Desire
20. The Trap of the Magnet Users
21. Slums - The Town of Traitors
22. Invitation to the Killing Fields