While looking for a ghost that helped him as a child, Satou Akira has run into a fair amount of spirits that he doesn't even see. One day, he goes to a supernatural detective agency for help, and he meets the adorable Yui and her devoted butler Kujou. Using her power, Yui ends up helping him with a number of the dangerous supernatural troubles he gets himself into. Akira starts to feel attached to the detective agency, and wants to learn more about the supernatural.
Hakoniwa no Reijou Tantei, Fräulein of the Little Garden, Hakoniwa Detective Agency, Hakoniwa no Fraulein, Hakoniwa no Reijou Tantei (Fraulein), Hakoniwa no Reijou Tantei (Furoirain), Hakoniwa no Furoirain, 箱庭の令嬢探偵, 箱庭の令嬢探偵〈フロイライン〉, คุณหนูนักสืบในสวนฝัน