This is a post-apocalyptic world. Yoko and Airi travel freely on their electric bike, Serow. Their destination this time is Hakone.

Their journey takes them from Hakone to Yokohama. They pass by collapsed bridges and see skyscrapers floating in the sea. As the two set out in search of food, an unexpected encounter awaits them.

Yoko and Airi get thirsty on their way to Tokyo, so they make a pit stop at Todoroki Ravine in Setagaya. After they quench their thirst, they walk around empty houses looking for food.

The girls visit Akihabara to find the source of Akiba Radio's transmission. As they explore the ruins of the former Electric Town, they come across butler and maid costumes - leading them to have some fun cosplaying.

They leave Akihabara and head over to Umihotaru, a rest stop on the way from Chiba. The girls run into trouble with the Serow as they struggle to ride it across the expansive wetlands of Nagareyama.

Leaving a storm in Tokyo Bay's Aqua-Line behind, the girls finally arrive in Umihotaru. They explore the area in the darkness until the rain stops.

The girls arrive at the Tsukuba Expo Center to carry out some maintenance for Airi. That's when a seemingly ordinary telephone booth there suddenly...

The Touringram gets updated, and a stamp function is added. Yoko and Airi head over to Kasumigaura to collect the nearest stamp.

Yoko and Airi want to ride on a circuit, so they head over to Mobility Resort Motegi. There, they encounter ISAAQ, a robot handling reception.

The girls' journey brings them to Oarai. After spending a night on a ferry at Oarai Port, they reflect on the journey they could have taken to Hokkaido abroad that very ferry.

After leaving Nikko, Airi hears a mysterious sound only she can hear. They head to the origins of that sound, to find out that it's the Yoshimi Hundred Caves in Saitama, a historical site.