[bsd.u] made "Her Smile" available on December 2, 2016. With Her Smile being less than a minute long, we are pretty confident that this song does not contain any foul language. That being said, this song is pretty short compared to other songs. There is only one song in 444, so we believe that "Her Smile" is a single. Her Smile is average in popularity right now. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.
The tempo marking of Her Smile by [bsd.u] is Adagio (slowly with great expression), since this song has a tempo of 75 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 4/4.
D Major is the music key of this track. This also means that this song has a camelot key of 10B. So, the perfect camelot match for 10B would be either 10B or 11A. While, 11B can give you a low energy boost. For moderate energy boost, you would use 7B and a high energy boost can either be 12B or 5B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 10A or 9B will give you a low energy drop, 1B would be a moderate one, and 8B or 3B would be a high energy drop. Lastly, 7A allows you to change the mood.