Between September 1 and October 31, 2009, the second installment of a contest called Do!

was held to give Do As Infinity fans a chance to compose songs that the band would later perform.

Of the songs received, two were selected to be placed on "∞2": "Everything Will Be All Right" composed by Shohei Ohi, and "Haruka" composed by Fumiyasu Sueoka.

[1] A music video was produced for "1/100" directed by A.T.[2] "1/100" and "Everything Will Be All Right" were used as promotional theme songs for professional Kyōtei boat racing in 2010.

"Pile Driver" was used as a promotional theme song for Hiroshima University of Economics in 2010.