The story follows Kunai Komori, a junior high school student who is also a ninja. Upon his father's retirement and his inheritance of his father's sword, he is charged with hunting down other blood-sucking vampire ninja.
- Kunai Komori (幸守クナイ Koumori Kunai?)
- A young boy who inherits his father's sword, Jakoto, on his fourteenth birthday. He comes from a family of vampiric ninja. When he drinks the blood of others, he transforms into a taller version of himself. He has a crush on Itzuna.
- Izuna Ninomiya (二ノ宮いづな Ninomiya Izuna?)
- Kunai's classmate and house guest. She is also descended from a long line of vampire hunters.
- Sagiri Komori (幸守狭霧 Koumori Sagiri?)
- Kunai's father, who has retired and let his son inherit the family's responsibilities.
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