Knight Flyer

Ten years ago, a girl named Sakuya gave Asahi a special pendant and made him a promise: though she must leave him, the pendant will protect Asahi in her place. Now, in the present, Asahi attends school and wants nothing more than to see Sakuya again, even though his friends don't believe she's real. Things change one day when Asahi is thrown off the school roof by an evil being and his pendant is shattered - he's saved by none other than Sakuya, who  now appears to be... a boy?! With mysterious forces aiming to hurt him, Asahi must figure out what his role is in this magical mess; but more importantly, he must try to figure out how this new male Sakuya relates to his long lost friend!