Emi Sasaki, the wealthy heiress, had been strongly supporting activities as the representative of a volunteer organization, but consumed by jealousy, resentment, and malicious lust, she falls into their trap and is dragged down into the depths of despair. Trapped within a hierarchical structure where pleasure and torture intertwine, her mind and body are gradually overtaken. Throughout this process, she experiences deeply engraved pain and the dark emotions blossoming within her soul.