Stellarium

Kanata is a scientist. After his former lover died, he became a workaholic and an alcoholic. He was working on an experiment when he made a mistake which resulted in boy's sudden appearance. He tried to shake off the boy's existence by trying to dispose of him, since he is not human, but his friend stopped him. Their relationship started to change when Kanata gave him a name, but deep inside his heart Kanata feels anguished by the reality before him. This boy's resemblance with his former lover is undeniable...