Trinity Blood

Trinity Blood is set in a world where vampires, known as Methuselah, coexist with humans, referred to as Terrans, following a devastating war. The two factions have formed separate societies, with the New Human Empire allied with the vampires and the Vatican Papal State representing humanity. The Vatican has established the AX unit to counter terrorist threats, particularly from extremist groups like the Rosenkreuz Order, which seeks to revive conflict. Led by Cardinal Caterina Sforza, the AX unit includes priest Abel Nightroad, a skilled vampire slayer, and his partner Sister Esther Blanchett, a young nun with a tragic past.