A vampire so overpowered the world sends a teenage girl to kill him, except she ends up protecting him instead. The action hits with real weight, the fanservice lands the jokes it's actually trying to tell, and the cast chemistry makes you care about people in a premise you've seen before. By the time you realize this show has no interest in subverting the harem formula, you're already invested in watching these specific people navigate it.

A legendary vampire believed to exist only in myth appears in Japan, accompanied by twelve Kenjuu and bringing calamity with it. To watch over and, if necessary, destroy this Fourth Primogenitor, the government and the Lion King Organization send Himeragi Yukina, an apprentice sword shaman carrying the strongest spirit spear made to oppose a primogenitor, to the Demon District of Itogami City. The vampire turns out to be Akatsuki Kojou, a high school student whose ordinary life ended after a fateful encounter gave him vampire abilities. Thrown together by circumstance, the two form an unlikely alliance as Kojou learns to accept his powers and both fight to protect the city from the chaotic forces rising around them. Based on Mikumo Gakuto's light novels, the show is a school action fantasy with ecchi and supernatural elements.