During the storm, a mysterious black distortion suddenly appeared inside the tunnel of Car 5! Is this a wormhole that connects to the original world? Should I jump in? Isn't there any danger? While Yuto (Eiji Akaso) and the others flinch, the distortion disappears. However, the group finds a glimmer of hope, and to make the distortion appear again, based on the research on time warp by physics professor Hasumi (Shotaro Mamiya), the group is led by Kato (Mi Inowaki) and goes back in time. In search of a clue to return to. However, Rena (Kotone Furukawa) and Koharu (Rin Kataoka), who is carrying a child in her womb, are reluctant to take the risk of returning to the past. Each passenger had mixed feelings. Meanwhile, Naoya (Yamada Yuki) is confused about his feelings for Sae (Kamishiraishi Moka). While Yuto is starting to realize this, Naoya makes an unexpected decision. And then the distortion appears again... Towards the shocking climax!