When I first listen to this song, I first thought it’s Hirano Aya or other singer, but then as I’m watching the Blood Lad I notice that Hirano doesn’t voice any character in the show so I know it must be somebody else that sing the OP.  Turn out to be May’n, a frequent anime singer.  She always produce solid music.  Great song.

It’s the 2nd track on the ViViD single.  For some reason this song doesn’t get enough exposure and I have no idea why because it sounds great.  I don’t think the song is on her 2014 album either.  And I also can’t it find on youtube or other site, so I had to upload it myself.