Itsuki Uragiri, a reserved high school student, leads a solitary life, finding solace in the company of his mischievous sister, Tsumi.
Their world turns upside down when Miharu Seiriki, a mysterious transfer student, enters their lives, claiming to be a Dark Primordial seeking Itsuki's assistance.
Itsuki has doubts and uncertainties but eventually agrees to assist Miharu, setting in motion a chain of events that will test his limits and unveil hidden abilities within him.
Itsuki embarks on a journey that transcends ordinary existence, venturing into a realm where creation and destruction collide.
