"Jidaishin" is Do As Infinity's 24th single, released on September 29, 2010. It was released on the band's 11th anniversary and was sold only at the mu-mo website in Japan. This single was offered in two different ways, both with special boxes that brought the CD plus some personalized face and body towels. It contains two tracks: the single and its instrumental version. It was composed by Kazunori Watanabe. The same day Do As Infinity released the single, there was a free concert, aired on the Nico Nico Douga website for its promotion.