This CD single is part of the Nazo no Kanojo X Bluray Volume 2. As with the first volume, I bought the Bluray mostly to get this CD single because they did not offer any other way to get the full size version of the song.
As if the mastering "engineer" is merely putting a check mark on a software, this one also has just about 6dB less dynamic range than the pristine Bluray version. At least they're consistent that way. In case you missed it, that was sarcasm at work.
To the idiotic, incompetent, spineless, and soulless mastering "engineer" and whomever else involved in destroying the art, go to hell. Wait, I should be polite. Go the hell, PLEASE! Oh, and in case you stick around longer than I do, I'll make sure to curse you when I become a ghost, that is, until you finally go to hell.
CD version level decreased by 6dB to similar power level as the normalized BD version.