As heirs to the nation's leading conglomerates, these two are the absolute monarchs of this high school. Amidst a silence that even teachers dare not break, Reito Mimasaka tramples over everyone with violence and power, reveling in his dominance. However, it is merely a game to color his tedious daily life.

Only Guest, who carries herself as a cold and composed young lady, can neutralize the venom of the boy nicknamed the "Mad Dog." On a rooftop shrouded in the scent of blood and the sound of rain, he swears that even if the world becomes his enemy, he will never let you go. A reign for just the two of them begins, where possessiveness, dependence, and distorted affection intersect.