facility sponsored by the United States' National Security Agency, researching parallel universes alongside Ms. Maki Kasahara under the supervision of Professor Tomizawa. They know that the Hokkaido Tower, which began operating in 1996, replaces matter around it with matter from other universes, but they do not yet know why it does this for only a 2-km radius. Takuya becomes involved with the Uilta Liberation Front after he learns that Mr. Okabe is its leader; his factory workers are the other agents of the organization. Okabe signs Takuya on for an excursion to Ezo with Uilta. Sayuri is revealed to have been hospitalized over the past three years, having developed an extreme form of narcolepsy; she has been sleeping continuously for most of the three years. Her mind is trapped in an unpopulated parallel universe, where she is all alone. Tomizawa has discovered that she is somehow connected to the Union's research into parallel universes and the Hokkaido Tower's ability to change the surrounding land into alternate possibilities, but Tomizawa keeps this information, as well as her whereabouts, secret from Takuya initially. Tomizawa is secretly working with the Uilta Liberation Front and lets Mr. Okabe know about Sayuri, while Mr. Okabe reveals that the Uilta Liberation Front plans to bomb the Hokkaido Tower to incite war against the Union, hoping that this will lead to the reunification of Japan. Takuya finally learns of the most likely scenario through his coworker – that Sayuri was used by her grandfather, a Union physicist, to channel all of the Tower's unstable dimension-creating energy somewhere other than Earth, the implication of him not having done so likely having resulted in the dimension creating chain reactions around the tower to continue growing in area until it enveloped the whole world. Saddened, he goes back to the old warehouse where he and Hiroki were working on the plane, only to find Hiroki, who wants Takuya to help him complete the plane to save Sayuri. He coldly points a gun at Hiroki and has him choose between Sayuri and the World without waiting for an answer – walking away in pain. With Okabe's guidance, Takuya locks up his coworker and takes Sayuri away from the NSA compound – Takuya and Hiroki finally come back together to work on the plane. Takuya helps to finish the final programming of the plane, as they plan, using the cover of the