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"Challenger" is the third EP by Japanese boy group JO1. There are three editions of the album: each features a total of four tracks, although the content varies. The song "Born To Be Wild" serves as the title track on all editions. Their digital single "Tsutaerareru Nara," which was previously released as the song for a KitKat commercial, is also included on all editions. A special edition with all tracks was later released for digital streaming and download.