According to the Binfield Kingdom Chronicle, there once existed a modest, serene nation called the Winfield Kingdom, whose sovereign and royal lineage were known for their splendid white wings. Hamura Shou has recently enrolled at Yuusei Academy. When the headmaster mentions a student named Misonou Kai, Shou becomes convinced that Kai is his younger twin brother whom he lost during childhood separation. Suddenly, a mysterious earthquake thrusts Shou into an alternate world along with two other pupils. In that realm, after a monster"s attack, Shou unexpectedly unleashes enormous white wings that pierce the sky and echo across the valley in the heart of darkness.
