Call of the Night manga volume 19 features story and art by Kotoyama.

Nazuna gets jealous when Ko starts spending most of his time at school and with his human friends. Is he secretly dating someone? At the same time, Ko notices that Nazuna hasn't been sucking his blood. Is she sourcing her meals elsewhere? One thing's for sure - it's time they both face their true feelings for each other and deal with the consequences!