Shoumetsu Toshi

The entire population of a city disappeared—vanished without a trace. Yuki, the sole survivor, joins Takuya, a contract courier, on a perilous journey to find answers within the newly named ghost town “Lost”. With a letter from Yuki’s father as the pair’s only lead, a secretive organization refuses to let Yuki and Takuya’s meddling go unchecked.

(Source: Funimation)