Maimai's voice sounds really unique. She's not the best or anything, but I totally prefer to listen to her than I do Maimi to be honest. Maimi has improved but she still sounds so... flat? Sometimes. I don't even know what it is.
The only Mai-part I wasn't too crazy about was her extended "ah" at the end, but that's something that will probably get better over time and with the recording. Otherwise, I was really surprised with how much I loved watching and hearing her.
I think mai sounds good in Adam to Eve. Overall I only LOVE mai's voice paired with nakky, it's like the awfulness just cancel each other out and we're left with something great idk.
Maimi and Maimai aren't very good singers IMO, they aren't stable enough and their tone is a bit weird, they're not awful, but they're just not good enough. Thankfully Chisa and Airi are great vocalists, and all of them are great dancers, so their performances are always great.
While I don't like this song as much as Crazy kanzenna otona and Aitaix3, it's pretty good and love the outfits, they're are being sexy and they can pull that off perfectly!