As per the Binfield Kingdom Chronicle, the Kingdom of Winfield was a peaceful and small nation with a ruling family adorned with stunning ivory wings. After enrolling in Yuusei Academy, the headmaster acquainted Hamura Shou with Misonou Kai, a fellow student. As days went by, Shou began to suspect that Kai could be his long-lost twin whom he had been separated from in their childhood. But, a sudden turmoil leads Shou and two other students to an unknown realm where, after fighting a beast, Shou surprisingly manifests his own grand alabaster wings. [Synopsis by MAL Rewrite]