Anti-social, awkward young man seeks a fun, sexy vampire for blood-sucking and transformation into her submissive. One sleepless night, Ko goes out for a walk in the streets. Life after dark is a revelation! Especially when he meets the flirty Nazuna. However, she is a vampire. That's okay. He also wants to become a creature of the night. But the transformation doesn't come so easily... Kyoko is scheming her ambitious plan to rid the world of vampires. How can Ko and Nazuna stop her? Then, when Ko gets injured, it leads to questions about his humanity. Meanwhile, some relationships are mended while others dissolve. And of course, a new haircut!