In a secret gathering popular among wealthy BDSM enthusiasts, Hinami, who once aimed to become a professional singer, finds herself under the control of the rich and powerful Uenuma, showcasing her voluptuous body, beautiful voice, and uncontrollable masochistic reactions. The one entrusted to dominate her is professional trainer Tsuchikawa—but he harbors deep romantic feelings for Hinami. Their relationship soon grows intense, leading to Hinami becoming pregnant with his child. Enraged upon discovering he's been betrayed by his beloved sex slave, Uenuma orders Tsuchikawa to endure brutal torture.