Call of the Night, Vol. 7 by Kotoyama

[Viz] Antisocial, dorky boy seeks fun-loving, sexy vampire for blood-sucking and transforming into her minion. One sleepless night, Ko slips out to walk the streets. Life after dark is a revelation! Especially when he meets flirtatious Nazuna. Except that she’s a vampire. That’s okay. He wants to become a creature of the night too. But transformation doesn’t come that easily... When Nazuna and the gang track down the secrets of her past, every answer only leads to another question. Who turned whom, exactly? What chain of events and relationships made Nazuna into the—uh—person she is today? Midori, on the other hand, would rather her human existence remain buried. But then she meets one of her “offspring” with a mysterious secret... Meanwhile, detective Anko pursues her vendetta against all vampire kind, invading their private lives and spaces!