Hype. I discovered that song through Vesper's cover and fell in love with it. NijiJP's Joe Rikiichi did a good cover too, of the longer version.
Kinda curious how Calli's voice will work with this song, but I'm sure she'll make it work. It definitely fits thematically - it's basically about a god of death being unimpressed with a doomed soul's begging for mercy.