Extra terrestially moon born, Touya Sagami lives aboard the Space Station Hotel, Anshin [Reassured] and is training his AI robot "Dukky" secretly by removing its limiters. When a group of youths who qualified for the Deegle Space Experience for Youths visits, Touya Sagami has no choice but to mingle with the Earthlings...

So this official visual novel sequel actually takes part just before the "true ending" in the prequel where Okabe has undone everything, back in the beta timeline. Kurisu has been murdered and he is so depressed and traumatised that he refuses to try one last time in reaching Steins Gate where World War III never happens. Without...