Sheena had previously worked with Nagoshi during her Ringo Expo concerts in 2008, and on the songs "Zero Chiten Kara," "Togatta Teguchi" and "Yokyō" on her solo album Sanmon Gossip (2009).

Bassist Hitoshi Watanabe had previously worked with Sheena as a member of Bōtoku Vitamin, one of the bands who performed on her album Utaite Myōri: Sono Ichi (2002).

[6] "Kodoku no Akatsuki" is a song featuring lyrics written by screenwriter Aya Watanabe, who wrote the screenplay for the NHK morning drama Carnation.

[8] OK Music reviewers felt that "Kodoku no Akatsuki"'s "sentimental lyrics and electric piano are impressive", believing that it would be a popular song at Sheena's live concerts.

[9] All music is composed by Ringo SheenaPersonnel details were sourced from the liner notes booklets of "Irohanihoheto/Kodoku no Akatsuki" and Hi Izuru Tokoro.