The Kirionira, malevolent beings from a parallel realm, breach the human world via dreams, countered solely by hunters who harness their libido as a potent weapon. Descended from a lineage of hunters, Riku Yoichi excels in this role due to his abundant sexual energy. After vanquishing the Kirionira king and achieving peace, he sacrifices his sexual prowess. Upon his return to his hometown, Yoichi discovers the demon threat persists, yet he lacks the means to combat it. Seeking help from childhood friend Namba Midori and her peers to reignite his passion, he faces rejection as they refuse to assist.