This song is a/an for Tetsuwan Tantei Robotack. It was performed by Robotack All Stars. "Ii ja nai" (いいじゃない "Ii ja nai"? "Come On!") is the second ending theme of Tetsuwan Tantei Robotack. * Lyrics: Tamanosuke Ōga (大賀 玉之輔 Ōga Tamanosuke?) * Composition & Arrangement: Hideki Fujisawa (藤沢 秀樹 Fujisawa Hideki?) * Artist: Robotack All Stars * Episodes: 32-45