In a modern metropolis, behind the veneer of scientific progress, a "coexistence society" has emerged in which vampires are managed by the government's Bureau of Other Species and stave off their hunger with the tasteless artificial blood they are rationed.

In this modern age, where humans live with loneliness and heartbreak, there is a discreetly whispered-about, top-tier rental boyfriend dispatch service called "Étoile." It is, in fact, a front company created by vampires starving for real blood to harvest the "finest emotions" of humans.