Marie's daughter, who continues to be a central figure in the estate's activities. The estate’s stoic maid. Rui Takamizawa:
: The stoic and enigmatic maid who serves the Mamiya household. Takamizawa Rui
If this isn’t the exact game you meant, please clarify, but this structure will still help for any “Final Empress” superboss in a turn-based/TRPG.
What sets Nocturne apart from its predecessor is the expanded cast and the palpable tension within the mansion's walls:
"Sleepless Nocturne: The Final Empress" appears to be an adult-oriented visual novel (eroge), likely developed by the studio (known for high-quality 3D animation and distinct art styles) and possibly released around late 2023 or early 2024.