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Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.

The eccentric, self-proclaimed mad scientist Rintarou Okabe has become a shell of his former self. Depressed and traumatized after failing to rescue his friend Makise Kurisu, he has decided to forsake his mad scientist alter ego and live as an ordinary college student.

The film takes place one year after the events of the anime series. After going through a painstaking journey across multiple "World Lines" due to the invention of "D-Mail," text messages that can be sent to the past, Rintarou Okabe has assumedly landed in the "Steins Gate" World Line, in which none of his friends would have to die and a future ruled by SERN due to the invention of a time machine no longer exists.