Call of the Night manga volume 5 features story and art by Kotoyama.

Ko seriously considers the pros and cons of becoming a vampire. But every human has a different take on it, and one just wants to kill them all! Then, when the police are alerted to Ko’s nighttime jaunts, they start to cramp his style. Ko learns something surprising about vampire Haka—and gets a tempting offer. Nazuna has a change of heart—but not about everything. And Ko wants to know what vampire Kiku’s intentions are regarding Ko’s deliciously human friend Mahiru...