Hmm, this show is just one giant time paradox.
So Okabe went back in time to prevent Kurisu from dying but was the one who killed her in the first place? And the future Okabe experienced everything the current Okabe did (witnessing Kurisu's corpse, saving Mayuri repeatedly, trying to save Kurisu again) but decided to wait 15 years and build a real time machine. That means time traveling is part of his life in all world lines?
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