Steins;Gate: The Movie - Load Region of Déjà Vu

A year after the events of the anime, time-travelling scientist Rintarou Okabe is trying to live with the consequences of the journeys he made across different world lines. He begins suffering strange lapses before vanishing from reality altogether, leaving Kurisu Makise as the only person who still remembers him. With no one else aware that Okabe ever existed, Kurisu searches for a way to restore him without causing another disruption to the world line.