After criticizing an R-19 harem novel for never delivering on its premise, Do Yoojin awakens inside its world as a discarded hero with the class **Sex Warrior**.

Sexual activity grants him experience and empowers his partners—but a worsening supernatural heat will kill him if left unsatisfied.

Armed with knowledge of the unfinished story, Yoojin sets out to conquer dungeons, save the doomed heroines, and build the harem the original author never delivered.