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When he discovers that Mayuri is still fated to die, Okabe works with Kurisu to reverse the effects of D-Mails that have irreversibly changed time.
Okabe finds Suzuha's father, but his attempt to reunite them results in tragedy that he sets out to correct with the time leap machine.
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.