Yumeka suffers from a debilitating cycle of severe insomnia. Desperate for any relief, she receives a peculiar stick of "in-kō" incense from a suspicious young man. Unbeknownst to her, lighting this incense will unlock a journey into a sensual and confusing romance that blurs the lines between dreams and harsh reality.

That night, overwhelmed by her sleeplessness, Yumeka burns the mysterious "in-kō" and finally succumbs to drowsiness. She wakes up not in her bed, but within the seductive walls of the Dream Brothel —a pleasure house operated by powerful demonic beings who specialize in selling fleeting moments of ecstasy and desire.

Inside, she encounters Yato, the famed "Ice Courtesan." His magnetic and mysterious aura is strikingly similar to a regular customer at the cafe where Yumeka works. Confused yet irresistibly drawn to him, Yumeka finds herself captivated by the intense, seductive sensations Yato awakens within her.

Dive into this intensely erotic experience where desire reigns supreme, and the boundaries of dreams and the waking world shatter completely. Can Yumeka find true rest, or will she only find pleasure in this dangerous, nightly fantasy?