See You Later, Fantasy World. We Hope That Tomorrow Comes Again

A brief description of the manga See You Later, Fantasy World. We Hope That Tomorrow Comes Again:

Let’s go on a trip, with you in the passenger seat. Through this doomed other world.

This world is dying. As people crystallize and disappear and are swallowed by the white desert, a lost person from the modern day, Kosuke, is driving around in a car in search of a way to return to his original world.

Along the way, he meets a half-elf girl, Nito. Searching for the “golden ocean” depicted in the notebook left by her mother, the two continue meeting and parting with other survivors.