Though WWIII is on the horizon, Okabe attempts to live a normal college life. However, a newly developed AI is about to shake up his world.

After a chance encounter with Maho where they discover knowing someone in common, Okabe has his first face-to-face with her special AI, Amadeus.

Mayuri tries to bring everyone together for a Christmas party at the lab, but Okabe has a rude awakening.