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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.
Kurisu persuades Okabe to let her die and Mayuri live. As Okabe destroys the phone microwave, he gets a critical message from Suzuha.
Okabe undergoes a personal sacrifice in an attempt to bring the world lines back into order and save the lives of his partners.