Yumeka suffers from severe insomnia. One day, she lights a stick of “in-kō” incense that she received from a suspicious young man— without realizing it will mark the beginning of a sensual love that unfolds on the border between dreams and reality… On a night when she’s desperate enough to cling to any possible cure for her sleeplessness, Yumeka burns the “in-kō,” and for the first time in a long while, she’s overwhelmed by drowsiness and falls asleep. In her dream, Yumeka steps into the Dream Brothel, a pleasure house run by demonic beings who sell fleeting moments of ecstasy. There, she meets Yato, a man known as the “Ice Courtesan”. His mysterious aura and commanding presence strongly resemble a regular customer from the café where Yumeka works. Confused yet irresistibly drawn in by the seductive sensations Yato awakens within her, Yumeka is pulled into an erotic experience where desire, dreams, and reality intertwine…