A year has passed since Okabe reached the Steins Gate world-line when Kurisu visits her friends at the Future Gadget Lab. But something's not quite right. Strong emotions blur the world-lines and trigger deja vu. Before she knows it, Okabe disappears. Hoping to save the mad scientist who tried countless times to save her, Kurisu must make a decision: risk everything, or live in a world without Okabe.