"Huan Di" is a trans-international organization, while "bsgj" is a mysterious organization affiliated with the "CIA", a complex family in which black and white are indistinguishable, and a girl who has been destined to walk on the edge of "black and white" since she was born. , One is a close partner, and the other is a childhood sweetheart who knows each other. All the stories start from a strange event... An angel with broken wings, facing family, friendship, and love, where will he go?