The Unbreakable Machine-Doll Complete Soundtrack CD Vol.Ⅱ (機巧少女は傷つかない コンプリートサウンドトラック CD Vol.2,Kikō Shōjo (Mashin-Dōru) wa Kizutsukanai Konpurīto Saundotorakku CD Vol.Ⅱ?) is the second volume of the complete soundtrack of the Unbreakable Machine-Dollanime series. It was composed by Masaru Yokoyama and Hige Driver and was arranged by Masaru Yokoyama. The complete soundtrack was released bundled along with the third volume of the Unbreakable Machine-Doll Blu-ray and DVD, released on February 26, 2014, almost five months after the airing of the first episode of the anime series, and features twenty-five soundtracks.
The track, "Dianthus", was named after Nadeshiko which was played on her fourth appearance, during Raishin's second dream of the past of her, and on her fifth appearance, during Hotaru's fourth appearance that triggered Raishin's flashback of her, in the anime.