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Kurisu persuades Okabe to let her die and Mayuri live. As Okabe destroys the phone microwave, he gets a critical message from Suzuha.
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.
Okabe travels back in time with Suzuha to just before Kurisu's death to witness the dawn of the time machine arms race and the spark of World War III.