A Black-Haired, Straight-Haired Life Starting in the Apocalypse

Waking from a fitful, unsettled sleep, the girl finds herself in a world turned into an apocalypse by an unknown pathogen, with the deep, dark Toyosaki refuge before her.

"Akiko, are you all right?"

Her senior, Kasumigaoka, asks beside her.

Ah, no matter whether I'm all right or not, I'll survive with my senpai in this jungle of steel and concrete.

This is the story of a black-haired girl who awakens, and the other black-haired girls she encounters, as they walk along the edge of the apocalypse.