Kimi no Naka no Palladium

There is a world called Palladium, ruled by God with black wings and God with white wings. The world used be united, but it is now divided into two regions. The main character is Aile, who has been living at an orphanage. But one day, he leaves there and is saved by Ventvert, who says he is Aile's older brother, when Aile is lying by the roadside. Ventvert offers Aile to collect their separated brothers together…