Vocal collection disc included in Pure Marriage ~Akai Ito Monogatari Complete Pack~
Album was composed by Sakurai Naoya and was released on August 31, 2018. Soundtrack consists of 9 tracks tracks with duration over about 25 minutes. Album was released by Lass Pixy.
CD 1
| 1 | PureMarriage ～マーガレットの誓い～ | 03:22 | |
| 2 | PureMarriage ～マーガレットの誓い～ ショート版 | 01:40 | |
| 3 | PureMarriage ～マーガレットの誓い～ インスト版 | 03:21 | |
| 4 | PureMarriage ～夢闇に浮かぶ三日月の揺り篭～ | 03:26 | |
| 5 | PureMarriage ～夢闇に浮かぶ三日月の揺り篭～ ショート版 | 01:45 | |
| 6 | PureMarriage ～夢闇に浮かぶ三日月の揺り篭～ インスト版 | 03:26 | |
| 7 | PureMarriage ～妹背泡沫～ | 03:31 | |
| 8 | PureMarriage ～妹背泡沫～ ショート版 | 01:50 | |
| 9 | PureMarriage ～妹背泡沫～ インスト版 | 03:31 | |
