Devils Line

Vampires live among humans so naturally that most people cannot identify them. They do not need blood to survive, but fear, anger, or intense attraction can awaken a craving powerful enough to turn them dangerous. University student Tsukasa Taira discovers this hidden world when a longtime friend reveals what he is during a confrontation with Yuuki Anzai, a half-human vampire investigator.

Anzai works with a unit handling vampire-related crime and has built his life around one strict rule: never drink human blood. Growing close to Tsukasa makes that control harder, even as feelings develop between them that neither can easily ignore. Their relationship becomes a constant test of trust, especially when people on both sides are determined to prove that humans and vampires were never meant to coexist.