Caterpillar is a 2010 Japanese drama film directed by Kōji Wakamatsu, partially drawn from Edogawa Ranpo's banned short-story "The Caterpillar" .

Tarō Hirai , better known by the pen name Edogawa Ranpo , was a Japanese author and critic who played a major role in the development of Japanese mystery and thriller fiction. Many of his novels involve the detective hero Kogoro Akechi, who in later books was the leader of a group of boy detectives known as the "Boy Detectives Club" .