"Angel Game"―a mysterious game where chosen individuals gain the ability to control powerful elements with a circle-shaped symbol on their left hand, known as the "Angel's Heart". The catch? In order to wield this power, one must require a certain significant "misfortune" in life...? Today, due to increasing crime and vandalism from those that possess the "Angel's Heart", this power and anyone involved with it is now frowned upon by society and "Angel Game" is now limited to a mere competitive sports―so that no one would use this power outside of monitored tournaments rules and conditions―a decision everyone still debates on whether it's the correct thing to do. Is it a gift for the unfortunates, or a curse that causes misfortunes? Should this power be kept merely for entertainment or will it someday revolutionize mankind for all eternity? Just what is the true purpose of Angel Game, to this world...?