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Shio no Machi: Jietai Sanbusaku Series

The era of "salt damage" 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...?

(Source: Hakusensha, translated)