Rena agrees to help Riku keep his secret about Nene... in return for the truth about his past with Amane. Photographs of a mysterious character dubbed 'Suraga' have surfaced, Joe and Clara Kirishima rejoin the squad, and Tsukishiro formulates a theory about the mysterious piles of abandoned TVs. Then the 'Source of Infection' reveals to Riku the truth about Nene, something that he has been refusing to believe himself...