Kurisu returns to Akihabara only to witness Okabe suffering from timeline distortions that erase him from existence. As the only one who remembers him, she must choose between honoring his wish to avoid time travel or risking everything to save him.
After spending a year in America, Kurisu Makise returns to Akihabara and reunites with Rintarou Okabe. However, their meeting is short-lived as Okabe begins experiencing uncontrollable flashes of alternate timelines—an ominous sign of his past time-traveling exploits catching up to him. The phenomenon escalates until he suddenly disappears from existence, leaving Kurisu as the only person who remembers he was ever there. Left in shock, Kurisu faces an agonizing dilemma: heed Okabe’s warning and avoid time travel to prevent further distortions in reality, or defy his words in a desperate attempt to bring him back. Whatever choice she makes, it will shape the past, present, and future in ways ...