Prologue: An Angel Has Spread Its Wings

Guardian Angels are entities that exist in a space beyond humans' domain. They have the duty to protect humans from imminence until life will be retrieved from them. This story revolves around an angel who sacrifices herself to rescue a suicidal human being. As a punishment, the angel is sent to the world as a powerless human to pay for its sins of disobeying the rules of the guardians and to complete an important mission that will bring her back to the world of angels.