The episode begins with Konoha waking up and finding Mamoru, now an elderly man, beside her. She is confused and believes she dreamed about returning to the year 2023 and meeting an aged Mamoru. He explains to her that Akihabara has transformed into an upscale residential district, where otaku culture disappeared years ago.

Konoha is shocked to learn that Akihabara is no longer the otaku hub she remembers. Mamoru tells her that the area was redeveloped, and the otaku shops were replaced by high-rise apartments and office buildings. Konoha is also surprised when she sees an advertisement for "Fate Gears of Order," a game she doesn’t recognize, which hints at major changes in the gaming world.

Mamoru reveals that Alcohol Soft moved to the U.S. after the success of "The Last Waltz," which was adapted into various media and caught the attention of American companies. Konoha is overwhelmed by the changes and feels responsible for the shift in history, believing her actions led to the decline of Akihabara and bishojo culture.

Mamoru proposes a plan to Konoha: to develop a new game that can rival "The Last Waltz" and release it in 1999 as a competing product. In his opinion, this could preserve both timelines and save bishojo culture in Akihabara. Konoha hesitates but agrees to take on the challenge, and Mamoru offers his help along with support from PC-98 computers.

Konoha and Mamoru begin working on the new game, striving to create something that can stand against their earlier creation and alter the course of history. The episode ends with Konoha’s determination to give her all for this new project and stand against her former self to restore the world she loves.