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.

Piyo-Tan: Oyashiki Sennyuu Daisakusen! is a visual novel, developed and published by Prototype, which was released in Japan in 2008.