Shoumetsu Toshi

One day a town is annihilated. Yuki is a young woman who is said to be the only person left alive from the town after the annihilation, and Takuya is a loner and a smuggler. Together, with the letter left by Yuki's father, they go toward the town, now called Lost, but unexpected obstacles stand in their path. The thoughts of those left behind, secret and mysterious organizations, and hidden conspiracies await Yuki and Takuya as they move closer toward the mystery behind Lost.

(Source: Anime News Network)