Tsukiya is a member of the Incubus clan who has become exhausted by the pain of falling in love with human men and causing their demise. To avoid any more of these tragedies, he has closed off his heart and vowed to never again feed on human souls. Nevertheless, Gento, an unwavering demon, remains steadfastly devoted to Tsukiya, watching as his lovers fade away time and again. Gento cannot understand why Tsukiya persists in seeking love from mortals, knowing it will bring him nothing but protracted agony. Will Gento's unyielding persistence finally win him entry into Tsukiya's heart many years later? Additionally, can Tsukiya help a young Incubus through the anguish of his own love life?