Torikago

In the beginning of this story, protagonist's mother lies on her deathbed. Before passing she tells her son that her father holds a position of great power, and that he must seek him to gain what is rightfully his. He goes in search of this man named Danda, and finds him soon enough. Danda accepts his son’s claim, but only with open-arms held halfway back. Out of all the rooms in this grand palace, our protagonist is stuck living in a room little more than a servant’s quarters. While exploring the palace he meets his sisters-in-law and their mother who has recently married Danda. Eventually he comes across a mysterious singing girl trapped in a birdcage. This is where Danda’s true motives are shown: our hero has been assigned to care of this girl. But as the days go by in care of her, the questions surrounding Danda’s “most precious treasure” abound!

[From White Masq]