探偵は、今夜も憂鬱な夢を見る。

Reiki Beni (Tomonori Hirose), the second head of the Beni Detective Agency, along with his partner Shoji Ai (Gentoku Aoki), underground idol Saori (Asuka Kishi), and Yayoi (Reiko Yakima), Reiji's grandmother and the owner of the detective agency, spend their days searching for pets and investigating cheating at the detective agency they inherited from their grandfather.