The following day, Tuesday, Date and Iris begin investigating NAIXATLOZ and their connection to Renju, where Date learns more about Iris's "Uncle," and the pair discover Hitomi privately speaking with So Sejima. They eventually learn from Mama that the person that she was going to introduce to Date was actually Pewter, who is Renju's current boyfriend. They find Pewter and interrogate him, where they learn that Pewter has been leaking information on the case to Renju, orchestrated #89's escape on behalf of Renju's wishes, and ordered the mercenaries to kidnap Iris. Pewter controls Aiba to shock Date, and he kidnaps Iris and takes her to the Okiura Fishery warehouse. Date and Aiba, with assistance from Moma, Ota, and Mizuki, perform a rescue operation for Iris, taking her away from Pewter's clutches. Date speaks with Iris about her "Uncle" again, and reveals that she only knew him by the nickname "Falco," the same as the escaped #89. She eventually reveals that the late night visitor she had was actually Renju, who tried to take her to an abandoned factory in the Kabasaki District and escaped, fearing for her life. The two visit the factory and discover a prototype Psync Machine, and as Iris collapses due to brain failure, Date decides to Psync with her to save her life just as he believed he did in So's Somnium. However, despite his best attempts, Iris succumbs and dies to her sudden collapse, with her last thoughts wondering if Date was actually the person she was looking for this whole time. This concludes the Iris Route. In another branch in Iris's Somnium, Date and Aiba do not believe in Iris's words about NAIXATLOZ, and decides to leave her with Ota and Mizuki while he continued to investigate. Past midnight on Tuesday, Date meets with Hitomi, and the two discuss Iris's delusions, wherein Hitomi reveals Iris has a malignant Grade-IV brain tumor and only has a month to live, at most. The brain tumor caused the various delusions Iris had throughout the story, as well as other side effects she was experiencing. Suddenly, Date receives a phone call from Mizuki, stating that Iris had gone missing, looking for "the person I trust most." Date, Mizuki, and Ota begin searching for her, and eventually Date arrives at the Okiura Fishery warehouse, where, inside a frozen forklift, finds the frozen body of Iris Sagan.