Two songs commemorate the 15th anniversary. The first song is "Christmas Spirit" with producer by Yancy. This is a soulful song about the uplifting spirit of Christmas and the happiness that is all around us in this new song that has been a long time coming. It is a lovely number that begins with her daughter's voice saying, "Merry Christmas! The second half of the song features a gospel arrangement . The gospel arrangement in the latter half of the song was arranged with Fukuhara's live performance in mind. The second song was written by Emi Meyer, a singer-songwriter who had almost the same debut period as Fukuhara. Emi Meyer wrote the lyrics with the image of supporting activities for the establishment and education of alternative schools, which Fukuhara is involved in as a life activity. Yancy arranged it as a respectful arrangement for Phyllis Dillon, an oldies reggae artist whom Fukuhara loves, played all the instruments, and even mixed it. It is a reggae tune that can be enjoyed in winter.