Its been years, decades, since aliens arrived earth and colonized humans, adoctrinated them to sing and perform on tournaments for their enjoyment, it was simple, if the crowd liked you more than your opponent at singing, you lived, and if not, you died.

Mafuyu had been in love with Kanade this whole time, even if she knewed she liked Mizuki, she loved her in silence

After Mizuki's dissapearance, she was aware of Kanade being way more depressed and unenergetic, she had a plan after knowing that she had to sing against Kanade

"..." she waited her turn at the other side of the glass, looking at the stage