>>1754244The top commenter in that video got it right. When the other girls sing, it feels like you're at a concert or are listening to a pro. When Ame sings, its like you're listening to your childhood friend that you're doing karaoke with.
She messes up, misses a few notes, but it's what adds to her girl-next-door charm. I guess you could say it's S O U L (though I'm not saying the others are soulless).