Succubus Alice has been ordered by the Incubus King to "collect more semen." She always devours men until they are completely drained, and in the end, she repeatedly milks them so violently that it takes their lives. However, one day she meets Kazuki, who is different. No matter how many times she devours him, his semen never runs out, instead it overflows more and more thickly! Intrigued, Alice starts living with Kazuki at first to meet her quota, but as they share the pleasure of being intertwined every night, she gradually finds herself truly drawn to him...