Despite appearing calm and easygoing, Ko struggles with feelings of isolation and finds little enjoyment in school, friendships, or the expectations placed upon him. Unable to sleep at night, he begins wandering the streets after dark, discovering a sense of freedom that contrasts sharply with his daytime routine.

the vampire responsible for introducing Ko to the hidden world that exists after sunset. Unlike the elegant or intimidating vampires often found in fiction, Nazuna is laid-back, messy, playful, and frequently acts more like an eccentric young adult than an immortal predator.