While walking home from work one day, a doctor named Shuichiro notices an angel, Kohaku, stuck on a tree while being attacked by a crow. He rescues Kohaku and, in return, Kohaku offers to grant him a wish. However, Shuichiro is satisfied with his life - he has a decent home, good looks, and a well-paying job as a doctor - so he does not request anything. As Kohaku is honour-bound to grant the wish, she chooses to stay with him in his home, and helps with chores.