(It's not a crime) It's just what we do——演唱者：窦靖童
主题歌电影版MV中，窦靖童与“
安生”、“
七月”跨时空相遇。飘渺灵动的曲风中，黑白画面与彩色电影片段交叉剪辑，窦靖童清澈磁性的嗓音和“安生”、“七月”的羁绊成长交融，歌词娓娓道出女生心事，诠释剪不断、道不清的大胆青春。在这支MV的片尾还剪入了一段窦靖童对电影《
七月与安生》的观后剖白。
歌词：
Some time ago， some time had gone。
One came back crying， one cold dawn。
I told a lie， she made a truth。
It‘s not a crime it’s just what we do。
All the times you‘d think that I was holding back。
Did you think I was just running from what I can‘t have。
Yesterday you called and you were crying。
I think the saddest words were I‘ll stop trying。
Said the world deprived you of your wisdom。
Then you asked me do I like who I‘ve become。
Every Time you‘d make me question all the things in me。
Did you think that all I wanted was to believe。
Was to believe。
