"おしりたんてい" is an educational app that tells the story of a detective with a bottom for a face. It offers a unique approach to solving challenging cases with a touch of humor. Users are introduced to a small client seeking help, setting off a series of intriguing events. By interacting with the detective's face, players can uncover clues and solve mysteries. The app is available for iPhone and is part of a book series by FLAMA Inc.

The app is designed to engage young readers in a fun and interactive way, encouraging problem-solving skills and creativity. With four books in the series and ongoing updates, "おしりたんてい" promises unlimited free content for users to enjoy.