A vampire girl trying to enslave you should be terrifying. Instead, Kouhei spends the entire show getting emotionally manipulated by someone half his size who genuinely has no idea how to be evil, and somehow that becomes the most human relationship in the castle. The show refuses to pick a lane between genuine supernatural horror and slapstick comedy, which sounds broken until you realize that's exactly where the actual romance lives, in the space where neither of them knows what they're doing. By the end, you're not watching a photographer and a vampire anymore; you're watching two people who need each other figuring that out one failed curse at a time.
Kouhei has always seen what others can't: spirits bleeding through his camera lens. When he stumbles into a crumbling German castle, he finds something far more dangerous than ghosts. Hazuki, a vampire trapped for centuries, sees him as her ticket to freedom. She needs his blood to break the seal binding her, but Kouhei's body refuses to cooperate. Frustrated and desperate, she strikes a deal: help her escape, and she'll leave him alone. Except Hazuki doesn't go away. She follows him back to Japan, moving into his grandfather's house, and suddenly Kouhei's ordinary life fractures into chaos. Hazuki is petulant, childlike, and completely unprepared for the modern world. She's also searching for her mother, someone Kouhei suspects might be connected to his own mysterious past. As strange supernatural events spiral around them both, Kouhei discovers that his ability to photograph the invisible runs deeper than anyone realized. What begins as an unwanted burden becomes something neither of them can live without.