Three girl detectives solving impossible cases in a demon city sounds like setup. What actually happens is you watch them become each other, their comedic rhythms bleeding into the mystery solving until you can't tell where the joke ends and the real stakes begin. Kotono and Natsuki's banter isn't filler between plot beats, it IS the plot, the thing that makes the horror land harder and the reveals matter more. By episode 26, you're not watching a mahou shoujo mystery anymore. You're watching three people who learned how to be human together.
Three orphaned girls with supernatural abilities patrol a sprawling city cloaked in perpetual darkness, where rational explanations crumble against impossible crimes. Kotono lives under the protection of a convent's nuns. Natsuki maintains her day job as an idol while secretly investigating the strange occurrences plaguing their world. Misaki carries fragmented memories of past lives and an intimate connection to the supernatural forces at work. When a mysterious boy stumbles into their lives with no recollection of who he is, the investigation takes a sharp turn. The girls discover they're not simply solving isolated incidents but confronting a much larger conspiracy. Powerful forces want to accelerate the world's judgment day, while others fight desperately to prevent it. The line between savior and villain blurs as the three detectives uncover truths that challenge everything they believed about their city, themselves, and the nature of good versus evil. This is mystery wrapped in gothic atmosphere, where friendship becomes both weapon and liability.