LOST

He's off in search of a certain man's life.... Harboring doubts about Dorry, a man he had previously arrested, inquisitive cop Yagi sets off to uncover his past, arriving at a town isolated by winter snow. Despite the town's hostility toward outsiders, he secures the cooperation of a local postman and an orphan with no last name, and begins his investigation....

(Source: MangaPlaza)

Note: Includes 2 extra chapters.