Death Loop Reijou wa Ikinokoru Tame ni Ryoute wo Chi ni Someru You desu

"The game shall not end until the demon lurking among the participants is slain." Lady Hermina, daughter of Count Einhorn, never imagined she would become a piece on the board of a lethal contest known as the "Summoning Ritual of a Wicked God." Yet fate has cast her into precisely that role—sealed within a sprawling, ancient castle in the frozen north, accompanied only by her childhood friend and devoted maid, Charlotte. The rules are ruthlessly simple. Among the eight participants gathered within the castle, two have been marked as "demons," bound to take the life of one victim each night. The remaining players, in turn, must root out the killers by day, casting votes to execute whoever appears most suspicious. There is no retreat and no reprieve: no one may leave the castle until every demon has been destroyed, ensuring that the bloodshed will persist until one side is annihilated entirely. With death stalking the halls night after night, Hermina is forced to draw upon every scrap of her cunning simply to stay alive. But mere survival is not enough—for she must also shield Charlotte, the one person she cannot bear to lose...!