"Your blood and flesh, all of it is mine." An ikigami and a healer, together their souls support each other, blooming into love... In the distant future, ordinary teacher Yoshino learns that he is a "donor" for the strongest species, the "ikigami." These warriors are tasked with protecting the country. "The unique ability of a donor is to use their bodily fluids to heal ikigami." Yoshino learns this fact and is shocked. Thus, Yoshino is forced to live with Kidou... At first, he is like a beast, demanding Yoshino's bodily fluids, but slowly, the underlying loneliness begins to show... "Someday, if I met a donor, could they come to love me? That thought is the only reason I survived..."