Shibou Yuugi de Meshi wo Kuu.

One day, Yuuki wakes in a dress of maid’s uniform inside a mysterious manor. After she enters the dining room, she sees five other girls wearing the same. Soon, they all realize that the manor is full of deadly weapons and lethal traps, and the only way to escape is by participating in the most brutal games. As the horrible truth becomes clear, all girls turn pale except Yuuki. The obvious reason is that she is not new here. Yuuki is a professional player of death games and lives on the money earned from these competitions. So she is ready to make the most of this chance.