Sae (Moka Kamishiraishi) and Rena (Kotone Furukawa) are walking through a sea of trees when they find a dead body buried there. Yajima (Suzunosuke), a passenger in Car 6, appears in front of the stunned duo and tries to catch them, but Sae is the only one who is unable to escape. After hearing about the situation from Rena, who ran away, the members of Car No. 5 decide to make a weapon for self-defense with the help of Yonezawa (Joichiro Fujiwara). The people in Car 5 are beginning to see the people in Car 6 as the enemy, as they are stabbing Kato (Mi Inowaki) and putting Sae in danger. Meanwhile, Naoya (Yamada Yuki) and Yuto (Akaso Eiji) arrive at car No. 6 in search of Sae, witness a shocking scene inside the car, and question Yamamoto (Hagiwara Masato). Then Yamamoto starts talking about the "incident" that happened on the day of the time warp...