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Okabe locates the missing IBN 5100 and uncovers the identity of the mysterious "FB" but realizes that getting the computer back means losing Kurisu.
When Okabe discovers that Moeka has committed suicide, he attempts to undo the act through D-Mails, leaving Moeka feeling betrayed.
Okabu hopes to keep Kurisu alive by not hacking with the IBN 5100, but he soon realizes that either she or Mayuri must die in the beta world line.