After a commuter train suddenly accelerates into a tunnel, the passengers in one of its cars lose consciousness and awaken in a desolate landscape.
After Kayashima discovers the drinks from the cart in the forest are missing, he joins Shirahama, Kato and Hatano in searching for a source of water.
Tanaka grabs Kayashima's bag of barber tools and chases after a mysterious figure. Later, Hatano suddenly collapses in pain while searching for food.
Shirahama and Kayashima carry the critically wounded Kato back to the train car, where they and the other passengers work together to save his life.
Car No. 6's de facto leader pleads with Shirahama's group to work together, return to their original time and warn the world of an impending calamity.
Kayashima and Shirahama find bloodstains in car No. 6 while searching for Hatano. The passengers of car No. 5 craft weapons to defend themselves.
Rena and Akashi find a source of fish and salt, but the people of car No. 6 have claimed the area. Kayashima volunteers to go and negotiate with them.
Although the wormhole closes, Yonezawa makes an electrifying discovery that gives his fellow passengers hope for returning to their original time.
Shirahama and the others reunite with their loved ones but have trouble getting people to believe their story. Kayashima develops a worrying ailment.
Yonezawa uploads a video that begins to turn the tide of public opinion. As the asteroid hurtles toward Earth, Shirahama struggles to find a purpose.