"Demons." Ageless, immortal beings living in the shadows of the mortal realm. The way to gain immortality is to kill a "Demon"; the price is to take on their role. A man who killed his Demon lover; a Demon who commits suicide over and over without someone to kill her; a girl who interacts with Demons.... The curtain rises on a life-and-death stakes game of musical chairs between Demons and mortal humans.
Reporter Rei Kurisu, eight years into this career without a single scoop to show for it, was starting to sweat a bit. So, when a tip comes in that the home where the famously unsolved K City Family Murder took place is soon to be torn down, Rei immediately sets out to investigate. But this house may hold more secrets than ever expected. It starts with a single peculiar photograph, and the further Rei probes, the more hidden truths and pieces of the victims' shocking past come to light.
Kazuhiro Oyamada is a college student suffering from insomnia, causing his health to suffer. Kazuhiro decides to use his summer break to go back to his hometown to recuperate. When he arrives, he can't find his grandparents. Feeling something's off, he asks his parents about them, but they react suspiciously. That's when Kazuhiro discovers the "truth" of this strange mystery... This highly popular suspense-thriller finally has its comic adaptation!!