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When Okabe discovers that Moeka has committed suicide, he attempts to undo the act through D-Mails, leaving Moeka feeling betrayed.
Okabe tries to convince Ruka that she was originally a male and that only by undoing the D-Mails that made the switch can they save Mayuri's life.
Okabe locates the missing IBN 5100 and uncovers the identity of the mysterious "FB" but realizes that getting the computer back means losing Kurisu.