Shio no Machi: Jietai Sanbusaku Series

This is the era of "Engai," when salt fills the city.
Mana, who lives in Tokyo which is on the verge of collapse, picks up a weakened young man carrying a heavy backpack named Ryouichi. Together with Akiba, a man who acts like her guardian, the three head towards Ryouichi's destination, the sea, but...?
A complete manga adaptation of Hiro Arikawa's timeless masterpiece! From the team that brought you Library Wars: Love & War!
(Source: Hakusensha, translated)