効かない…！ by 久保早瑠菜 Song Details

久保早瑠菜's ' "効かない…！" was released on its scheduled release date, September 17, 2025. With This song being less than two minutes long, at 1:53, we are fairly confident that this song is not explicit and is safe for all ages. Based on the duration of this song, this song duration is much smaller than the average song duration. There is only one song in サイレント・ウィッチ 沈黙の魔女の隠しごと Original Soundtrack, so we believe that "効かない…！" is a single. The popularity of 効かない…！ is currently unknown right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

BPM and Tempo

The tempo marking of 効かない…！ by 久保早瑠菜 is Presto (very, very fast), since this song has a tempo of 180 BPM. With that information, we can conclude that the song has a fast tempo. The time signature for this track is 3/4.

Music Key

B♭ Major is the music key of this track. This also means that this song has a camelot key of 6B. So, the perfect camelot match for 6B would be either 6B or 7A. While, 7B can give you a low energy boost. For moderate energy boost, you would use 3B and a high energy boost can either be 8B or 1B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 6A or 5B will give you a low energy drop, 9B would be a moderate one, and 4B or 11B would be a high energy drop. Lastly, 3A allows you to change the mood.

Want to find the BPM and music key for other songs? Check out our BPM and Key Finder page!