Piyo-tan: Oyashiki Sennyuu Daisakusen

PiyoTan Oyashiki Sennyuu Daisakusen!: Ninomiya Tooru is an apprentice detective who receives his first big assignment: going undercover as a housekeeper for Kazama Yukihiro, president of the entertainment company Kazama Enterprise.

There are five men living there, all with secrets of their own. Tooru must search for clues and talk to the inhabitants of the house in order to solve their mysteries.