Antique Magical Tools Whisper To Lady Alice: The Case Files Of A Royal Antiquarian summary:

Alice, a magical antiquarian, is involved in a locked-room murder at the royal castle where a tea party is held. The suspect is Tetra Heart, a princess with the right to inherit the throne. She has long been suspected of being a “witch who would destroy the world.” If you are suspected, you must be punished. That is the main principle of the “witch trials.” Not only the clarification of the secret room trick, but also the proof of witchcraft involved is not deemed necessary to determine the guilt. My reasoning will destroy such absurdity! Alice, whose life was once saved by the princess, takes on the case to prove the innocence of the “witch.” Unravel the whispers of the antique magical tools and save the princess from execution for witchcraft, a magical suspense story begins!