"Pikanchi Double" was released on 18 February 2004, and was used as the theme song for Arashi's starring film Pikanchi: Life is Hard dakara Happy, the sequel to Pikanchi: Life is Hard dakedo Happy.
The song "Pikanchi Double" debuted on 18 February 2004 and was utilized as the title track for Arashi's movie Pikanchi: Life is Hard dakedo Happy, which followed up the film Pikanchi: Life is Hard dakara Happy.