The cobbled roads of Enid where horse-drawn carriages travel ・Lavilio City A hotblooded Raymond was assigned to a special bureau in the police department that was in charge of exterminating a blood-sucking monster known as ‘Genty.’ At a secret evening party where Genty are rumored to frequent, Raymond meets Oliver, a skilled hunter who specializes in hunting down those monsters. Raymond, for some reason, gets partnered with Oliver, the melancholic and beautiful young man, yet unfriendly and with a sharp tongue, and gradually finds himself getting enchanted by his green eyes. However, Oliver refuses to acknowledge Raymond. One day, Oliver brings up the fact that ever since he was a young child, he’s been followed around by a Genty and that anyone that gets close to him is killed.