Geonmin's been having R-rated dreams about his upperclassman recently. When he's no longer able to handle weeks of sleepless nights, Geonmin decides to shove the upperclassman in one of the dreams, but the person who cries out isn't the upperclassman but a...demon?

Kook, an incubus who's come to ruin my sleep.

This is the story of the symbiotic relationship between Kook, cruel Incubus No.04469, and the college student Geonmin, who's already had enough!