It was ogey
the instrumental was way too loud but that's fine.
They both sound good because they're good singers, but their voices are too processed.
Matsuri sounds too stiff for example right at the beginning
https://youtu.be/2ys9IS5r9yA?t=16It sounds particularly squeaky and you can almost taste the compression. They chopped off the lows way too much in the whole vocal track for some reason.
Gura is too quiet and the processing messes up her vibrato, but they sound good together...
It would've been 100 times better with a competent mixer.
In terms of performance, it was great on both sides, I love their voices and it's sad that you have to pay close attention to hear the harmonies because they were on point..
I blame the production/10.