Nahane commands the alien invasion force Valhallan from space, targeting Earth's conquest as the main antagonist in *Shinkansen Henkei Robo Shinkalion the Movie: The Marvelous Fast ALFA-X That Comes From the Future*. His arrival unleashes colossal monsters imperiling global security, forcing the Shinkansen Ultra Evolution Institute into action.

His assault causes the disappearance of Institute leader Hokuto Hayasugi. Simultaneously, a 9-year-old Hokuto emerges from an alternate timeline, creating a critical temporal paradox. This compels the Institute to deploy its experimental Shinkalion ALFA-X prototype with the younger Hokuto as pilot to confront the alien threat.

Nahane's name originates from the Japanese National Railways' classification system: the katakana ナ (Na) denotes "medium weight," ハ (Ha) signifies "second-class coach," and ネ (Ne) represents "sleeper car," reflecting the franchise's integration of railway terminology.

Leading Valhallan, Nahane orchestrates devastating attacks across Japan, uniting all regional Shinkansen Ultra Evolution Institute branches—Ōmiya, Nagoya, Kyoto, Hokkaido, Moji, and Yamagata—in defense with their Shinkalion forces. Earth's fate hinges on defeating Nahane and his army in the final battle.