Shimai Ningyou

A brother and sister were deeply in love, though their relationship was not destined to endure. The sister was afflicted by an incurable illness, and the brother devoted himself entirely to her care. For a time, this arrangement was stable. A significant change occurred when the brother encountered another young woman. Following her introduction into his life, his sister's condition deteriorated rapidly, culminating in her death. His love for his sister proved too powerful to allow him to let go of her memory. Convinced he had been betrayed by divine forces, he renounced his former beliefs and sought the aid of a demonic power. The demon agreed to assist him, but demanded a specific price: the blood of a virgin girl, who happened to be his new acquaintance.