By an unbelievable coincidence, Amano Taichi drinks the blood of the most well-liked woman within the academy and turns into extraordinarily enticing to the half-humans. Within the meantime, he has to make a deal: the exact same woman whose blood he drank protects him from assaults by the half-humans, and in alternate he should assist her awaken her true energy. To do that, nonetheless, he should strive very arduous.