Wandering

"Winter" has come and the world is now enveloped in snow and ice. Our protagonist, Nejiri, accompanies a traveling merchant as a lookout to protect him from the monsters known as "shadows" that attack people. But Nejiri has a secret. He is plagued by a strange feeling, as if something is "sprouting" out of his body... The story begins when Nejiri meets a girl in a certain town who notices his "strange feeling."

(Source: MangaDex)