日野皓正
While Ryo writes all the music, an assortment of session musicians perform the songs on the album, including four guitarists and bassists, five drummers, three pianists, and a violinist. Ryo cites drummer Masayuki Muraishi as an influence in the composition of "Rock 'n' Roll Nan desu no"; Muraishi contributes on several songs on the album. In composing "Feel So Good", Ryo employed bassist Kenji Hino, son of Terumasa Hino, after he became interested in a performance of his on a TV music program. Ryo felt using strings in "Hoshi ga Matataku Konna Yoru ni" was an essential part of the song; Crusher Kimura provides the strings for three songs on the album. Haruko Ohinata is credited for the chorus of the song "Utakata Hanabi". "Today Is A Beautiful Day" was mixed by Takeshi Hara, Yasuhisa Kataoka, Keiji Kondo, Masashi Kudo, Eiji Makino, Koji Morimoto, Okuda Supa, and Shuji Yamaguchi. Yuji Chinone provided the mastering.