Looks like Ayu is going to cover One Night Carnival by Kishidan, along with a lot of other folks covering the same song. I really enjoyed when she performed it with them during Hotel Love Songs.
https://www.kishidan.com/sp/news/#news96772
This has been bugging me lately. I have been listening to Secret (the album) a lot since it is that time of year, and I am trying to decide what the original 7 tracks were given the number of previously released songs. Thoughts?