Hybrid Syndrome

Those with white wings, called angels, and those with black wings, called devils, coexist in this world. Both groups are very prideful, and ostracize each other. Raum, a boy who was born from the union of an angel and devil, lives his life without anywhere to go. One day, he recieves a letter of admission from a school where both tribes seem to coexist. Urged on by his friend Ciel, an angel, the two of them decide to enter the school. Hiding his status as a hybrid, Raum engages with both angels and devils... [translated from DLsite]