Kyoichi, a boy born to the Sugami family, a priest in a certain town, had a beautiful older sister, Kaichi, who was six different. Kaichi, who has a strong power as a purifier, had a daily routine to make "Kaidan Nikki" that describes the weaknesses of the youkai she faced for Kyoichi. Such Kaichi disappears after a certain day six years ago. Kyoichi realizes that he is the cause of his sister's disappearance, and in order to regain Kaichi, he will aim to complete "Kaidan Nikki" in cooperation with her friend Chloe, the god of death.
 
 In order to find her missing sister, a demon drama with a strange god of death begins. Youth Occultic Mysterious Manga Volume 1 !!