In this world, Love and Hatred exist strongly in human's hearts. But when one human feels pure hatred toward another, they unintentionally summon the Kirau Beast on the hated one. These are creatures of Hatred, in the form of a Wolf blazing with fire. The summoner has a choice of becoming a hateful Kirau Master, or save their hated one from being devoured by the beast. Normal humans can banish Kirau's by using the whip that was summoned along with the beast. But Kirau Masters, the ones who watched their hated ones get killed by the beast and become their master, are unstoppable. That is why Extinguishers exist. To banish the beast from the Master. But shouldn't there be a Beast of Love? Extinguishers seek to revive the creatures of love that has been wiped out by the Kirau Beasts.