Nacchi's album has a new song because her album is not mean to be a wrap-up-and-goodbye Christmas-gift like all the Zetima's MEGA BESTs. Nacchi's has the tentative title of "Complete Best", it's a hachama release, and it happens to be on the same day Zetima decided revive all their hiatus acts, which I find kind of ridiculous. Morever, Nacchi has not only one new song in the album, but also a new single coming out a week before with the solely purpose to make people buy the Best, in which the single will be not.