Angel's Feather

There was a family with white wings. They lived happily in a kingdom away from humans. However, their peace begins to fade. A family of black wings, which appeared in a mutation, tried to control them. The black wing clan uses magic that the white wing clan does not have to invade the kingdom. The magic hand extends to the king and his queen, and the two of them are buried in the dark. The young prince left behind is hidden in the human world by his confidant.

The king had a younger brother. He chose to fall in love with a human woman, which is forbidden to the kingdom, and left the kingdom. But the black winged clan didn't miss him either. He dies by protecting his wife and his newborn twin sons. And the years passed, and the story began to move.

Shou Hamura, winner of the national kendo championship, is transferred to an only boys private school. He there thinks he meets his lost young brother Kai, who strongly denies this. Strange things happen at the school somehow referring to a magical world called Winfield. After re-encountering his best friend Naoto and while meeting many new friends, which each have specific abilities, he soon discovers his own inheritance and the difficult tasks ahead.

[Edited from AniDB]