Genmukan: Aiyoku To Ryoujoku No Inzai Episode 1

Kido Satoru is your below-average detective. One day, he recieves a letter with a ticket. The job is a simple lost item case involving a ruby ring. He accepts the case and sets off for the mansion where a young mistress, an old butler, a beautiful teacher, a lovely maid, and an ugly manservant all await his arrival. He then sets out to search for the missing ruby ring, but a bizarre spectacle of desire and shame awaits him.