From The Red Fog (Manga) Vol 02

A young boy raised in a cellar enters the light. As the lonely child journeys to find companions who share his tastes, he suddenly finds himself a member of the Organization-a mysterious assassins' guild led by an enigmatic nobleman named Midwinter. Are his new associates those Ruwanda seeks? Or will the red fog descend once more, leaving a trail of bloody corpses in its wake...? Yen Press
(W/A) Mosae Nohara