Kou Yamori has traded his old routine for vampire hunting in this coda to Call of the Night, picking up after the main series' end. He and fellow hunter Anko take on a case involving Paradise, a religious group linked to the idol duo Wednesday is Sunday: Amu Miyamoto comes looking for help after her bandmate Mei gets pulled into the group's orbit. Kou revisits familiar faces, including the vampire Nazuna, as the investigation unfolds.