Blood+ opens in Okinawa, where Saya Otonashi lives quietly with her adoptive family until a brutal encounter shatters her ordinary life and awakens a hidden war. When the Chiropterans, blood-drinking creatures that lurk in the shadows, begin to surface, Saya is forced to confront fragments of a past she cannot fully understand and a power bound to her own blood.
With Haji and the Red Shield organization at her side, she travels from place to place following scattered clues that bring her closer to the truth behind her origins. The pursuit stretches beyond Okinawa, widening into a conflict where each battle reveals more about why these monsters hunt her and how deeply her blood is tied to the struggle. As Saya pieces together what she has lost, Blood+ balances action, suspense, and supernatural drama with the emotional bonds that keep her moving forward while the truth remains just out of reach.