A socially awkward and clumsy young man seeks a fun and sexy vampire to serve and transform into her assistant. One sleepless night, Ko goes out for a walk in the streets. Life after dark is revealing! Especially when he meets the playful Nazuna. The catch is that she is a vampire. That doesn't bother him. He also wants to become a creature of the night. But the transformation doesn't come so easily... Nazuna becomes jealous when Ko starts spending most of his time at school and with his human friends. Does he have a secret relationship with someone? At the same time, Ko notices that Nazuna hasn't drunk his blood. Is she getting her meals elsewhere? One thing is for sure—it's time for both of them to confront their real feelings for each other and handle the consequences!