.hack//Quarantine sees the current server becoming increasingly unstable. To fix the problem, Helba replaces it with a copy of the Net Slum. At the bottom of a dungeon, Kite encounters Mia, a member of his party. He discovers that Mia is actually another Cursed Wave monster named Macha, whom he reluctantly defeats. Meanwhile, Cubia grows stronger, and Kite's team barely fends off its latest attack. In contrast, Operation Orca is a success as they destroy Tarvos, the next Wave monster. Kite seeks the advice of Harald Hoerwick, the creator of the game who survives beyond death through his AI incarnations. Aura appears and hints that Cubia is the "shadow" of Kite's Twilight Bracelet. Cubia ambushes them and destroys the AI Harald. In their final battle, Kite recalls Aura's hint and has BlackRose destroy the bracelet, causing Cubia to fade away. Without the bracelet, the final Wave member, Corbenik, ambushes the party in Net Slum Root Town. With the aid of the spirits of the coma victims, Kite penetrates Corbenik's barrier. Aura sacrifices herself to end the battle, restoring the network to normal and reviving all the coma victims.