This is the twitter of the second winner, "kocchi kocchi mai"/ Mai Ishiguro... She'd occasionally posted updates like "I still haven't heard anything about recording" and then in mid-january she tweets about "the moment I've waited for for almost 2 years is finally here, I'm so nervous!" ...Of course she tweeted a photo of her credit in the album booklet as well, hehe
She's very cute about it!
https://twitter.com/mai_19890707