Hakoniwa no Fräulein
箱庭の令嬢探偵【フロイライン】
A man named Satou Akira seeks help from a supernatural detective agency after encountering spirits he cannot see. He meets Yui, a skilled individual with the ability to assist with supernatural threats, and her butler, Kujou. Yui helps Akira deal with various dangerous situations involving the supernatural. As a result, Akira becomes more interested in the agency and the supernatural world.