The Inves are invading, Kouta's sister takes shelter, and Kouta patrols with the others. Trying to get the Golden Fruit, Ryoma reveals Project Ark to the world, which erupts into chaos. Then, without help from the Japanese government or Yggdrasill, Kouta and the other Riders lend a hand to the people left behind.

With the world falling into chaos thanks to Ryoma, Zawame City has become an isolated place infested with Inves. Kouta's sister Akira, along with others in shelters, go outside to call for help. Meanwhile, Redyue broadcasts an announcement over the radio to the whole world stating that Helheim will completely take over the Earth in a year. At the same time, Inves are commanded to hunt the citizens of Zawame City.

Yoko confronts Mitsuzane about his actions as Zangetsu Shin and whether or not he will tell Kouta, while Redyue plans on using human technology to further her own goals as well as bring back Rosyuo's queen. But to do that, Redyue requires a sacrifice.