自分たちの「5号車」と同時に未来に飛ばされた「6号車」の人々と遭遇した直哉（山田裕貴）、優斗（赤楚衛二）、紗枝（上白石萌歌）。IT企業の社長で6号車のリーダー的存在だという山本（萩原聖人）、工務店に勤める植村（ウエンツ瑛士）らの案内で彼らの居住場所を訪れると、そこにはなんと調理場やトイレに風呂、おまけに個室まで整えられた充実の暮らしが！ 元の世界に戻るため、5号車の乗客たちとも協力し合いたいと提案するが山本たちを簡単には信用できない直哉たち。しかし、山本の口からどうして未来の世界がこうなったのか、そして元の世界に戻る手掛かりとなる衝撃の事実が次々と告げられて…。そんな矢先、紗枝は優斗に好きな人がいると知ってしまい…。直哉、優斗、紗枝、3人の関係も動き始める。
Le leader improvisé du wagon n°6 implore le groupe de Shirahama de collaborer, de retourner à leur époque et d'avertir le monde d'une catastrophe imminente.
Naoya (Yamada Yuki), Yuto (Akaso Eiji), and Sae (Kamishiraishi Moka) encounter the people of "Car 6" who were sent to the future at the same time as their "Car 5". When visiting their place of residence with the guidance of Yamamoto (Masato Hagiwara), the president of an IT company and the leader of Car 6, and Uemura (Eiji Wentz), who works at a construction company, I find that there is a kitchen and a toilet. Enjoy a fulfilling life with a bath and even a private room! To return to their original world, Naoya and his friends propose cooperating with the passengers in Car 5, but they cannot trust Yamamoto and his friends easily. However, Yamamoto tells him one after another shocking facts about why the future world turned out the way it did, and the clues to returning to the original world. Just then, Sae finds out that Yuto has someone she likes... The relationship between Naoya, Yuto, and Sae begins to change.
