Sukkarakan is the debut studio album by Japanese singer Eito. It was released through A.S.A.B on December 24, 2020 for digital download and streaming and on January 1, 2021 on CD. It is primarily a J-pop album, with ingrained influences of reggae, folk, and R&B. Eito worked with his musical mentor, Rung Hyang on several songs on the record. The singer listed Hotdogs, In-Sist, and Chinatsu Matsumoto as the guest musicians on the album. The album peaked at number nine on the Billboard Japan Hot Albums and number eleven on the Oricon Weekly Albums chart.

"Happiness" (ハピネス) is a song written and recorded by Japanese-American singer-songwriter Ai. Originally released digitally on November 18, 2011 as the second single from Ai's ninth studio album, Independent, it was released physically on December 14, 2011, by EMI Music Japan alongside "Letter in the Sky".