Nigatsu No Eden

When Haruna Keiichi finds Shiki injured and unconscious in the snow, he feels compelled to take him in and tend to his wounds. After a somewhat rough start, Haruna & Shiki forge a friendship that goes much deeper for Haruna. He admits that he often gets attached to people, pets and anything he really cares about it. Because of this, he becomes worried that Shiki will someday leave him, so he tries everything in his power to keep him close.