Despite his many attempts, Okabe is unable to prevent the death of Mayuri, so he turns to Makise for help solving the riddle of time travel. Later, Suzuha's true identity is revealed

After the change in divergence fails to have a lasting effect, Okabe and Kurisu set out to further manipulate time in the hopes of gaining an IBN 5100.

In order to continue his work against SERN, Okabe must finally choose between saving Kurisu or Mayuri.