Stringed Seraphim Simulacrum

Amongst all the lovely ojou-sama schools of the world graced by The Cross, there exist a certain notorious set of four. Though no one ever calls them by their proper names, instead having adopted the sigils of the Heart, Spade, Club, and Diamond. Hidden beneath their divine facade are "mysteries" that often end in bizarre murders. Enter the Aces–students who face death without illusion, delivering justice in a world ruled by demons. When the Spades' entire student council is brutally slaughtered, only the Ace of Hearts can unravel the truth. But even she may not be ready for the horrors that await… [Edited from itch.io]