Angel's Feather

In the Binfield Kingdom Chronicle, it is said that there was once a small, peaceful country called the Kingdom of Winfield, whose king and royal family possessed great white wings. Hamura Shou is newly enrolled at Yuusei Academy. After hearing about a student named Misonou Kai from the headmaster, Shou comes to believe that Kai is his younger twin brother, who he was separated from when he was younger. However, after a mysterious earthquake, Shou is suddenly carried into another world with two other students. It is in this new world that, after being attacked by a monster, Shou suddenly unleashes great, white wings. Hamura Shou, winner of the national kendo championship, is transferred to an only boys private school. He there thinks he meets his lost younger twin brother Kai, who strongly denies this. Strange things happen at the school somehow referring to a magical world called Winfield.